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Answer:

PLASTER of paris, quick-setting gypsum plaster consisting of a FINE white powder (CALCIUM sulfate hemihydrate), which hardens when moistened and allowed to dry. ... Known SINCE ancient times, plaster of paris is so called because of its preparation from the abundant gypsum FOUND near Paris. good afternoon sis

EXPLANATION:

MENTION the following also nah how will we ANS if QUE is incomplete

ANSWER:

GROUP 1 elements contain 1 electron in their outermost shells. These elements lose this electron easily to ATTAIN the 8 electrons in their outermost shell. HENCE they from unipositive ion.

Answer:

lectronic Configuration in Groups

Elements in the same group have the same number of electrons in their outermost shell leading to similar valence shell electronic configuration. Thus, we observe a similar trend in the properties and chemistry of the elements in the same grou

Explanation:

The electronic configuration of an atom is the numerical representation of the arrangement of electrons distributed in the orbitals of the atom. This determines the position of an element in the periodic table and in turn its chemical behavior. It explains how the atoms are held together by the chemical bonds, and the peculiar trends which are observed in the rows and columns of the periodic table. In this article, we will discuss the electronic configuration of elements in the same periods and groups of the periodic table.

Electronic Configuration in Periods

The value of n, the principal quantum number, for the valence shell is the period of the element.

Different energy levels can accommodate different number of electrons.

The maximum number of electrons that a given energy level can accommodate is given by 2n2, where n is the energy level. So the first energy level (K shell) can hold up to 2 electrons, second level (L shell) can hold up to 8 electrons, and third level (M shell) can also hold 18 electrons and so on.

Thus, the first period with n = 1 can hold up to 2 elements by filling the lowest level 1S. The elements are Hydrogen and Helium with electronic configuration 1s1 and 1s2 This marks the complete filling of K shell.

The second period starts with Lithium and Beryllium which have 3 and 4 electrons and hence the last electrons enter the level 2s and they have an electronic configuration of 1s22s1 and 1s22s2 This is followed by the start of the 2p orbital filling. It starts with Boron (1s22s22p1) and ENDS with Neon (1s22s22p6) which marks the completion of L shell. Thus, 8 elements are present in the second period.

The third period starts with Sodium and ends at Argon while successively filling 3s and 3p orbitals. 8 elements are present in this period too.

The fourth period with n = 4 starts by filling the level 4s. It begins with POTASSIUM. However, we know that 3d orbital is to be filled before filling of 4p orbital starts. This marks the beginning of the 3d transition elements with Scandium (electronic configuration- [Ar]3d14s2). At zinc (electronic configuration- [Ar]3d104s2), the 3d orbital is filled.

The fifth period with n = 5 starts by filling the level 5s. This period consists of the 4d transition series which starts with Yttrium. Xenon ends the period by completely filling the 5P orbital.

The sixth period with n = 6 holds 32 elements with electrons filling 6s, 4f, 5d and 6p orbitals. Cerium marks the electrons entering 4f orbital giving rise to the 4f-inner transition elements, called the lanthanide series.

The seventh period with n = 7 includes the man-made radioactive elements with electrons filling 7s, 5f, 6d and 7p orbitals. Similar to period 6, this period also leads to the filling of electrons to 5f orbital, giving rise to the 5f-inner transition elements known as the actinide series

Answer:

A chemical bond is a LASTING ATTRACTION between atoms, ions or molecules that enables the formation of chemical compounds. The bond MAY result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in COVALENT bonds.

ANSWER:

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Answer:

ESSENTIALLY, mesophyll cells are highly DIFFERENTIATED cells that make up the mesophyll layer found in plant LEAVES. ... These cells also house chloroplasts thus making the mesophyll the SITE of PHOTOSYNTHESIS. Some of the main characteristics include: Located between the upper and lower epidermis.

In chemistry, the criss-cross method is a way to write the formulas of ionic compounds. The criss-cross method makes it easier to DETERMINE the SUBSCRIPTS for each element in an ionic compound. Using this method, the number ASSOCIATED with the charge of the first ION is ASSIGNED as the subscript of the second ion.

ANSWER:

CH3-CH3-CH2-CH3

pent-1-ene

ANSWER:

COVALENT BOND is the answer

ANSWER:

(B) 1,4-disulphonic ACID 3

Explanation:

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ANSWER:

I can't UNDERSTAND the QUESTION

ANSWER:

B) p-nitrobenzene sulphonic ACID / sulphanilic acid.

Explanation:

here's the REACTION:

ANSWER:

OK ok ok ok ok ok ok ok ok K ok ok ok ok o

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ANSWER:

Metals REACT with acids and produce metal salts and hydrogen gas. Generally, non-metals do not react with acids.

Some metals react with bases to produce hydrogen gas.

More reactive metals DISPLACE less reactive metals from their compounds in aqueous solutions.

Explanation:

In general, acids react with metals to give SALT and release hydrogen gas.

Bases do not react with metals and release hydrogen gas.

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Answer:

THEREFORE CH3⊕CH2 is the most stable carbocation from AMONG the given CARBOCATIONS.

ANSWER:

(CH3)3 C+

EXPLANATION:

The most stable CARBOCATION is 3° carbocation. (Tertiary)

:- OPTION (c).

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Answer:

COPPER sulfate pentahydrate | CuSO4. 5H2O - PubChem.

MOLECULAR Formula: CuSO4.5H2O or CuH10O9S

Synonyms: Copper(II) sulfate

pentahydrateCopper sulfate pentahydrate7758-99-8Bl...

Molecular WEIGHT: 249.69 g/mol

ANSWER:

ok

Explanation:

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EXPLANATION:

COPPER SULPHATE is the ANSWER

ANSWER:

it BECAME BROWN RED colour

al+h2so4=also4 + h2

caco3+hcl=cacl2+coh

ANSWER:

Melting POINT of Ga is 303K which is the ROOM temperature at summer.

Hence, Ga is called as the summer liquid.

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ANSWER:

C

Explanation:

C

Answer:

For example, on mixing a solution of BARIUM chloride with sodium SULPHATE, a white precipitate of barium sulphate is immediately formed. ... The REACTANTS changes into ions when dissolved in water and there is an EXCHANGE of ions in solution. This results in the FORMATION of product molecule

Explanation:

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ANSWER:

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ANSWER:

write a script for an ADVERTISEMENT (APPLE iPhone), I NEED A SCRIPT PLEASE HELP ME

ANSWER:

Explanation:

1-bromo 2-methyl but-2-ene

Answer:

CO2

Explanation:

CO2

The molecule of CO2 has 180∘ BOND angle it one be explained on the basic of. In the FORMATION of CO2 molecule of ORBITAL, hybridization of ORBITALS of carbon OCCURE to a limited exted involving only one x and ane p orbitals

The LIMITATION of the first law of thermodynamics is that it does not say anything about the direction of flow of HEAT. It does not say anything whether the process is a SPONTANEOUS process or not. The reverse process is not possible. In ACTUAL practice, the heat doesn't CONVERT completely into work.

Answer:

write a script for an advertisement (APPLE iPhone), I NEED A SCRIPT PLEASE HELP ME

EXPLANATION:

write a script for an advertisement (Apple iPhone), I NEED A SCRIPT PLEASE HELP MEWRITE a script for an advertisement (Apple iPhone), I NEED A SCRIPT PLEASE HELP ME

Given,

Mean of 5 numbers = 85

Total = (85*5)

= 425

Mean of 4 numbers = 80

Total = (80*4)

= 320

Value of number excluded = (425-320)

= 105

The Excluded Number is 105 that is Option (C).

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ANSWER:

SORRY I DINT UNDERSTAND the QUESTION

Answer:

B) low MELTING points and BOILING points

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No it's SIZE is DIFFERENT

Explanation:

6 ATOMS

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Answer:

TOTAL number of ELEMENTS DISCOVERED is 118

Answer:

each of two or more forms of the same element that contain equal NUMBERS of protons but DIFFERENT numbers of neutrons in their NUCLEI, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

"some elements have only ONE stable isotope"

Answer:

8 5959=58656hhvnjlvjbnb

ANSWER:

a:5.85% SOLUTION of NACL

Sodium ( NA ) is oxidised as it gains OXYGEN and oxygen GETS REDUCED

Answer:

Both SULPHUR dioxide and chlorine are good bleaching agents. Bleaching action of chlorine is based on oxidation while that of sulphur is based on reduction. Chlorine acts with water to PRODUCE NASCENT OXYGEN. ... Sulphour dioxide removes oxygen from the COLOURED substance and makes it colourless.

HACKING is IDENTIFYING and exploiting WEAKNESSES in computer SYSTEMS and/or computer networks.

ANSWER:

carbonez PROTECTING GROUP for

ANSWER:

Lithium borohydride is the answer MATE

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Explanation:

Answer:

Paul s w kबभ KAL keyless MAIL is all on STILL CH

Answer:

Someone who is an impostor is dishonestly pretending to be someone ELSE in order to gain an advantage. He was an imposter, who masqueraded as a doctor. Synonyms: fraud [informal], cheat, fake, IMPERSONATOR More Synonyms of impostor. QUICK word challenge.

Answer:

3(4)+5

= 12 + 5

= 17

2(4)+7

8+7

15

3(4)+5

12+5

17

ANSWER:

Na-isotope

mg2 -isotope

Explanation:

ISOBAR -ATOMIC no. \no.of proton\no.of NEUTRON are DIFFERENT

When atomic mass is defined in TERMS of gram it is known as gram atomic mass. When MOLECULAR mass is defined in terms of gram it is known as gram molecular mass. Molecular mass in gram is EQUAL to atomic weight of the ATOM.