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In H2S, S is the main atom which has 2 lone pairs.These lone pairs cause repulsion and move the H-S bond away causing non-linear shape.

PCl3 is a trigonal planar shape. The vector addition of the 3 dipole moments gives a better of 0. Hence its non-polar.

By sharing it's four electron present in valence shell

Carbon and its compounds form covalent bonds which are formed by sharing of electrons among same or different molecules. For example: Methane: Carbon has four un-shared electrons in its valence shell. To complete its octet, carbon needs four more electrons. This is donated by four other hydrogen atoms, forming four covalent bonds.

Carbon and its compounds formcovalentbonds which are formed by sharing of electrons among same or different molecules. Methane: Carbon has four un-shared electrons in its valence shell. To complete its octet, carbon needs four more electrons. This is donated by four other hydrogen atoms, forming fourcovalentbonds.

Bonds it likes toform, as it forms molecules.valenceofan atom is thenumber of bonds that it most commonly forms. thatcarbontypically forms4bonds, forexampleby combingwith 4hydrogenatoms.

So oxygen forms two bonds.

Carbon has four electrons in its outermost shell and need to gain or lose four electrons to gain noble gas configuration .but it can't gain or lose four electrons because it will require a large amount of energy and will become unstable . therefore carbon overcomes this problem by sharing of electrons with other atoms of carbon or with atoms of other elements . this is known as covalent bonds .

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1.Carbons are the bad conductors of the electricity because the carbon atoms do not have any free electron which is in the conduction band.

They are not able to conduct in the room temperature so, if you increase the temperature of the room, then the electrons will start acquiring energy and will start contributing to the conduction.

2.Name - Cyclopentane

no. of single bonds-15

single bonds 15 samaj mein nahi aaya

Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system.

A chemicalbond formedbetween two atoms through the sharing of pairs of electrons. ... An oxygen molecule contains a doublecovalent bond.Coordinate covalent bond: Acovalent bondin which one of the two atoms bonded supplies all of the shared electrons.

option B covalent and coordinate

thanks hey would you tell me the structure formula of it

propene has a double bond, which consist of 1 sigma bond and 1 pi bond ; this makes the total number of sigma bonds equal to 8.

an ideal gas, if we “compress” the gas by increasing P , the density ρ must increase as well so as to keepZ=1. For areal gas,Z, therefore,...

the correct answer is C

when z>1,real gases are difficult to compress

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.CCl4 has a covalent bondCaCl2 has an ionic bond.

Thelaw of reciprocal proportionswas proposed by Jeremias Ritcher in 1792. It states that, "If two different elements combine separately with the same weight of a third element, the ratio of the masses in which they do so are either the same or a simple multiple of the mass ratio in which they combine."

ro2=1/8=0.25thanks

Valence shell electron pair repulsion (VSEPR)theory :

It is a model used to predict the 3D geometry of individual molecules from the number of electron pairs surrounding their central atoms. It

BeCl2The central atom has no lone pair and there are two bond pairs. i.e., BeCl2is of the type EX2. Hence, it has a linear shape.

decibels is the SI unit of loudness

decibels is the correct answer of the given question

decibels is the answer for this question

decibel is the unit of loudness

option c is the correct..

it will ionise easily.

after mixing , total volume = 3l

so, [A] = 1/3 mol/L , and [B] = 2/3 mol/L

now if concentration of [XY] = 0.6 mol/Lthe 0.3 mole must have reacted from both A & Bso,

concentration of [A]eq = 1/3-0.3 concentration of [B]eq = 2/3-0.3

option 1

It's zero because water automatically melts at that temperature.

standard electrode potential of Mg2+| Mg can be measured with respect to the standard hydrogen electrode, represented by Pt(s), H2(g)(1 atm) | H+(aq)(1 M)...

A cell, consisting of Mg | MgSO4(aq 1 M) as the anode and the standard hydrogen electrode as the cathode, is set up.

Then, the emf of the cell is measured and this measured emf is the standard electrode potential of the magnesium electrode.

Eø =EøR-EøL

Here,EøR for the standard hydrogen electrode is zero.

∴Eø= 0 -EøL

=-EøL

1/2(F2,F-) is having +ve value.. of E° . so this is more stable than hydrogen. gas.

others will loose electrons readily

option 1 should be correct

because Mg2+ and Al3+ have same no. of electron in their orbitats ( that is 10)

mg2+,mg1+,mg+

i) The inductive effect is an experimentally observed effect of the transmission of unequal sharing of the bonding electron through a chain of atoms in a molecule, leading to a permanent dipole in a bond. It is present in a σ bond as opposed to electromeric effect which is present on a π bond.

ii) Electromeric effect refers to a molecular polarizability effect occurring by an intramolecular electron displacement characterized by the substitution of one electron pair for another within the same atomic octet of electrons.

answer is option B because nitrogen is half filled so it should be more

option B is correct answer

option B is the correct answer

option B is the correct answer.

Option (d) is correct.

neon will have positive electron gain enthalpy because energy is required to add an electron to it, since it has stable electronic comfiguration of 1s2, 2s2, 2p6.

Fluorineexists as a diatomic molecule in its free state (F2) and is the most abundant halogen found in the Earth's crust.Fluorineis the most electronegative element in the periodic table. It appears as a pale yellow gas at room temperature.Fluorinealso has a relatively small atomic radius.

give the number of electro negativity in the halogen's

tallen can I get to your no

You can post your doubts here and get solution

Canal rays or channel rays is the name given to the positive or anode rays by their discoverer, E. Goldstein.

Eugen Goldstein discovered canal rays.

Canal rays are positively charged. Theirrelative charge is +1and the massis 1.673 x 10^(-27)kg.

Flourine is the element with highest electronegativity

For the same molar concentration of NaCl and CaCl2, CaCl2 would be more effective in lowering freezing point. This is because freezing point depression is dependent on the number of ions present (colligative property). The more ions present in a solution, the greater the change in temperature. In general, NaCl has a value of i = 2 and CaCl2, i = 3 (van't Hoff factor, i). The expected value for i would be more accurate for more dilute solutions. This is because ion pairing can occur in concentrated solutions, e.g. a Na+ and Cl- can pair together and count as a single particle. In addition, the difference in expected and observed value of i is also greater for highly charged ions such as MgSO4.

The three conclusion regarding nucleus of an atom ara:1)nucleus of an atom is positively charged.2)nucleus of an atom is very dense and hard.3)nucleus of an atomis very small as compared to the size of theatomas a whole.

thanks

The three conclusion regarding nucleus of an atom ara:1)nucleus of an atom is positively charged.2)nucleus of an atom is very dense and hard.3)nucleus of an atomis very small as compared to the size of theatomas a whole.

Chemical equivalent is the weight in grams of a substance which displaces or combines with one gram of hydrogen. Chemical equivalent can be found by dividing the formula weight by its valence.

While the electrochemical equivalent of a substance is a simple ratio of its chemical equivalent weight to a faraday.

ECE = E/F E is Chemical equivalent weight, F is Faraday number.

In other words, electrochemical equivalent or Eq of a chemical element is the mass of that element in grams which is transported by 1 coulomb of electricity. Eq is measured with a voltameter.

the correct answer is 266.55k

266.55k is the correct answer

266.55K is correct answer

Mass number of element is 35Number of neutrons= 18

Formula to find number of protons: Mass number = number of protons + number of neutrons.35=× +18×=35 - 18X=17.Number of protons =17 and number of electrons also will be 17 as atom is electrically neutral.

Hence Element is chlorine

Electronic configuraton:1s2 2s2 2p6 3s2 3p5

Group number= 17Period number =3Valency =1

Atomic mass=25 answer

35 is the right answer

B) 27 is the correct answer

c) is the correct answer

options c is the correct answer.

a.25 is the mass number

a.25 is the answer of the question

answer is this question (a)

c is the correct answer for this question

c is the correct answer that means the mass is 35

194 g/mole x 0.289 = 56.066 g nitrogen (N)

56.066 g N x 1 mole N/14.007 g = 4.00 moles N

Thus, there are 4 moles of N per mole of caffeine or 4 atoms of N in 1 molecule of caffeine.

water vapour freezing is not a chemical change..it's a physical change as only the state changes and we can reverse the phenomena

Here,m = 0.0711Kf= 1.86∆Tf= 0.320Therefore,∆Tf=i×Kf×mOr, 0.320= i × 1.86 × 0.0711Or, i = 2.42Therefore the Van`t Hoff factor is 2.42

Atomic number of X = Mass number of X – No. of neutrons

Atomic number of X = 35 - 18 = 17

Electronic configuration = 2, 8, 7

Group number = 17

Period Number = 3

We know that only valence electrons take part in bond formation with different atoms.In the atom of 'X' element there are only two electrons since atomic number is 2. Thus, K shell is fully filled for this atom.Hence,its valency is zero. It will not react with other atoms of different elements.

answer of this question is 40g

40g is the correct answer

please like me

40g is the right answer ....

40g is the right answer

40g is the right answer

40g is the correct answer

abey chitiyon 40 gm hai pta hai par kaisey

option 20g is correct answer

40g is the correct answer of this problem

a) is the right answer of the following

a) is the right answer of the following

Option A is the correct answer

a) is the right answer of the following

40g is the correct answer

it means Kf and weight of solvent is just given to confuse us.. am i right?

C14 is an isotope of C12 Carbon. (C12 contains only 6 protons and 6 neutrons that are considered as stable element). Ionization of atmosphere converts C12 Carbon to C14.

Name: 14 CAtomic Weight: 14.0032419887.Half-life: 5707.762557078 .Boson, 6 proton, 8 neutron,Spin 0 Parity 1.C14 shows the chemical properties of tetravalent Carbon.

Carbon dioxide containing C14 is absorbed by plants that synthacize Carbohydrates that contains a little bit of C14, that does not lose radioactivity by any means we see the loss of magnetism, but only undergo decay to an element of next atomic number.

Except radioactivity and weight difference all other features remains the same). Whereas, N14 is the basic component of Nitrogen. Element Nitrogen (N), Being a gas occurs in Allotropic form encompassing 78% of our atmosphere and is a constituent of aminoacids.

N14: Group 15, p-blockAtomic Number 7,Mass 14.007. (C12 hasValancy 3 & 5.HCN (Trivalent Nitrogen)AgNO3 (Pentavalant)

All elements originated from Hydrogen by Nucleo synthesis such a way that 4H atoms fuse to form a Helium. 3 Helium fuse into Carbon and 4 Helium to one Oxygen. Some elements formed by fusion undergoes decay at any temperatures to form elements of other weights and Atomic numbers.

Radium decays to Uranium in turn becomes lead. Radio isotope of Iron decays by electron capture to manganese-55 and this process has a half-life of 2.737 years. Decay of Potassium to 40 Calcium(β-); 40 Argon(β+, γ) etc. Nucleosynthesis stops on planets. A few elements are man made in atomic reactors for theraputic purposes.

Sun containing some iron may be second or third generation star. Stars having high luminence extinct soon. Some 1st generation (13.5 billion years) aged red dwarf stars having 1st or 2nd level fusion elements and devoid of heavy metels exist in Milkyway. Heavy elements synthasised in big stars in a generation wise process, that each one undergoing massive nupernova exploition discharge a lot of debris that eventually form a new star and planetery system.

Thereisadifference betweenthe meaningsof the chemistrytermsatomic massandmass number. Oneisthe average weight of an element and the otheristhe totalnumberof nucleonsin the atom'snucleus. ... Themass number isa countof thetotalnumberof protons and neutronsin an atom'snucleus.

There is a difference between the meanings of the chemistry termsatomic massandmass number. One is the average weight of an element and the other is the total number of nucleons in the atom's nucleus.

Atomic mass is also known asatomic weight.Atomic massis theweighted average massof an atom of an element basedon the relative natural abundanceof that element's isotopes.The mass number is a count of thetotal numberof protons and neutrons in an atom'snucleus.

Key Takeaways: Atomic Mass Versus Mass Number

The mass number is the sum of the number of protons and neutrons in an atom. It is a whole number.The atomic mass is the average number of protons and neutrons for all natural isotopes of an element. It is a decimal number.Atomic mass value sometimes change over time in publications as scientists revise the natural isotope abundance of elements.

Atomic Mass and Mass Number Example

Hydrogen has threenatural isotopes:1H,2H, and3H. Each isotope has a different mass number.

1H has 1 proton. Its mass number is 1.2H has 1 proton and 1 neutron. Itsmass numberis 2.3H has 1 proton and 2neutrons. Its mass number is 3. 99.98% of all hydrogen is1H 0.018% of all hydrogen is2H 0.002% of all hydrogen is3H Together, they give avalue of atomic massof hydrogen equal to 1.0079 g/mol.

Atomic Number and Mass Number

Be careful you don't confuse atomic number and mass number. While the mass number is the sum of the protons and neutrons in an atom, the atomic number is only the number of protons. The atomic number is the value found associated with an element on the periodic table because it is the key to the element's identity. The only time the atomic number and mass number are the same is when you are dealing with the protium isotope of hydrogen, which consists of a single proton. When considering elements in general, remember the atomic number never changes, but because there may be multiple isotopes, the mass number may change.

As no of protons= Atomic number hence 7 protons -E.2.configuration is 2,7,hence 2+7= 9- BB. In atom A and B A- In number of nucleons as atomic number is 20 hence 20 neutrons 20 protons B- atomic number is 9hence 9 protons and 9 neutrons.