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a German scientist Dobereiner suggested that properties of ELEMENTS are related to their atomic masses. He made group three elements each , having SIMILAR chemical properties and called them triads.He showed that atomic mass of the middle ELEMENT was approximately equal to the mean of the atomic masses of other two elements. Examples :- Li , Na , K Ca , Sr , Ba Cl , BR , I Hope it WORKS !!!!

s as a reducing AGENT because of the LIBERATION of nescent hydrogen in the presence of moisture; SO2 + 2H2O ---------- H2SO4 +2H Alkali neutralises the acid (H2SO4) and shifts the equilibrium in the forward direction producing more nascent hydrogen.however,in acidic medium,the equilibrium is suppressed RESULTING in a lesser amount of nascant hydrogen.consequently,SO2 is better reducing agent in alkaline medium than in the acidic medium

"HOT ice" is a substance calledsodium acetate trihydrate. SOLID at room temperature, it melts into a liquidat 58 DEGREES Celsius. It can also be MELTED into a liquid and then supercooled, GETTING it down below its freezing point without having it crystallize. I hope it help

s and acidic salt because it is formed by the STRONG sulphuric ACID .Fe + dil. H2SO4 -------- FESO4 + H2 HOPE THIS HELPS !!!

it will HELP you .

adical is the ion formed after REMOVAL of hydroxide ion ( OH⁻ ) from a base .For Example :- NaOH ⇔Na⁺ + OH⁻ , here Na⁺ ion is BASIC RADICAL . Similarly some basic radicals are : Base       -->    Base radical1. NaOH   --> Na⁺ (univalent)2. KOH   -->K⁺ (univalent)3. Mg(OH)₂   -->Mg²⁺ (bivalent)4.Be(OH)₂  -->Mg²⁺ (bivalent)5. Ca(OH)₂  -->Ca²⁺  (univalent)6. CSOH --> Cs⁺ (univalent)7. H₂O  --> H⁺ (univalent)

r table is not same everywhere just like Rajasthan doesn't have enough WATER EXACTLY like that only there are not MANY PLACES which have a huge amount of water table .

h an intersting PASSAGE....ur answer are as follows: a. On my opinion... sameer is right. This is because whether of having natural resources , if any person is misuing or POLLUTING the environment, then it is wrong.b. The values associated with the answer is that we have to USE the natural resources in a good way, but not in the way by misuing or making HARM to others.Hope it MAY help....Plzz mark as brainliest.Plzzzzzzzz

es as CH4 means C comes in CENTER and H comes AROUND C

E,MIXTURE is an impure SUBSTANCE.Impure substance may be mixture of elements, mixture of compounds or mixture of elements and compounds.I HOPE IT'S HELP YOU PLEASE MARK it as brainlist..............

s HIGHER VALUE of LATTICE ENERGY I THINK so

s required to count 2 WHEAT grain.It means to count ONE mole of wheat grain the TIME required will be :–2grain = 1sec1grain = 1/2sec6.022×10^23grain=1/2×6.022×10^23sec6.022×10^23grain=3.011×10^23secwe KNOW that,60×60×24×365sec=1years31536000sec = 1years1sec = 1/31536000year3.011×10^23sec=1/31536000×3.011×10^23years3.011×10^23sec=9.49×10^16years(approx).

heat in the TWO CASES will be differentThe heat in the CLOSED vessel will be more as the will not ABLE to ESCAPED in the atmosphere

uld be a Chlorine Atom. Being atomic no 17 means it has 17 protons (which are positive) in the nucleus. Being a neutral atom - as opposed to an ion) it therefore has 17 electrons. Electrons are arranged in shells around the nucleus. The inner shell can contain 2 electrons, whilst the next two shells can contain 8 electrons each. For chlorine the 17 electrons would be found in the following configuration: 2,8,7 The outer shell of chlorine is therefore incomplete. It would be more stable if it had eight electrons to complete the outer shell. Chlorine, like all of the elements in group 7 (known as the Halogens) has 7 electrons in their outer shells, and this is what makes them so chemically reactive. During a chemical reaction they will strongly accept an electron from ANOTHER atom There are two ways chlorine can gain the ADDITIONAL electron it NEEDS to achieve a full outer shell of electrons. These two methods correspond to two types of bonding: ionic or covalent bonding. Ionic bonding This occurs when a non metal, such as chlorine, forms a bond with a metal. In this example I will USE sodium (Na) as an example of the metal as together they make up sodium chloride, which is common table salt. Sodium has atomic number 11, so has 11 electrons. These are arranged in shells in the configuration 2,8,1. So sodium atoms have one electron in their outer shell. To become more stable and have a full outer shell sodium will lose an electron, becoming a positive Na+ ion. When it loses this electron it has the structure 2,8 and a charge of +1. Chlorine too would like to achieve a full outer shell, which it can do by receiving an additional electron to increase its outer shell from 7 electrons to 8. It then has the electron structure 2,8,8 with a charge of -1. It is now a negative chloride ion (note the change in spelling for non-metal ions, from chlorine atom to a chloride ion). The positive sodium ions will be attracted to the negative chlorine ions creating the ionic compound sodium chloride. Covalent Bonding In covalent bonding electrons are shared not transferred. For example in the simp,e covalent molecule hydrogen chloride (a gas), the hydrogen atom shares an electron. Hydrogen is atomic number 1 so has only a single electron which occupies the first, inner, shell. It would like to have 2 electrons so it’s shell is complete. The chlorine and hydrogen form a bond by sharing one electron each, hence both atoms gain a complete shell. [GCSE CHEMISTRY - Covalent Bonding in a Hydrogen Chloride Molecule - What is the Structure of a Hydrogen Chloride Molecule? - GCSE SCIENCE.] Note: in both examples of bonding 5he diagrams use dots and crosses to represent electrons. This is simply a convention to illustrate the different initial locations of the electrons (dots for electrons from one atom, crosses for electrons that STARTED with the other atom. In reality electrons are indistinguishable.

) On addition of sodium carbon to ALCOHOL H2 gas OS evolvedii) doesn't reactiii) doesn't reactEthanoic acidi) GIVES corresponding saltsii) liberation OH H2iii) condensation of alcohol

h MUCH less ABUNDANT than nitrogen and oxygen in EARTH's atmosphere, carbon dioxide is animportant constituent of our planet's air. A molecule of carbon dioxide (CO2) is MADE up of ONE carbon atom and two oxygen atoms. Carbon dioxide is an important greenhouse gas that helps to trap heat in our atmosphere.

allic character of ELEMENTS DECREASES when we move from left to right in a period.Hence, in 2ND period,Most METALLIC : LITHIUM (Li)Most non-metallic : Flourine (F)HOPE IT HELPS!!

odic table fluorine have the highest ionisation ENERGY and CESIUM have lowest ionisation energy

e is the HIGHEST electro NEGATIVE ELEMENT in the PERIODIC table

ioactive ELEMENT of 17 GROUP in Tennesine(117) and that of group 18 is Oganesson(118).

═══════════════╕☬‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌‌ ‌ ‌ ‌ BRAINLY CONQUERER ‌ ‌ ‌ ‌ ‌ ☬╘═════════════════════╛molecular orbital theory:-⏩⏩According to Mot, atomic orbitals first combines to form .olecular orbitals which finally participate in bond formation .⏩Potential ENERGY of a bonding molecular orbital is always less than the potential ENERGIES of atomic orbitals .╒══════════════════════╕☬‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌‌‌ ‌ ‌ ‌ ‌ ‌ THANKS! ‌ ‌ ‌ ‌Regards ‌ ‌ ‌ ‌‌ ‌‌ ‌ ‌‌ ‌ ‌ ‌ ‌ ☬╘══════════════════════╛

assDensity_____

your ANSWER my FRIEND

lowing are the METHODS of waste management:1. Recycling - It is the process of extracting resources from WASTES. It may also be called as recover or reuse of the materials.2. Composting - It is the biological degradation or brake down of matter under aerobic conditions. Biodegradable wastes like left over food, vegetable peels can be placed in long pits where these are degraded biologically.3. Incineration - It is the process of burning biological waste at very high temperature to FORM ASH. 4. Landfills - It is a traditional method of dumping garbage into low lying area away from residential areas.5. Sewage Treatment - In this sewage waste is TREATED at sewage treatment plants to remove the solid wastes and kill microbes from it for further use.HOPE YOU LIKE THIS!!

due to diagonal relationship both of them RESEMBLE in ELECTRONEGATIVE both of them have FORMING OXIDE

your ANSWER ...........

are generally prepared through β ELIMINATION reactions, in which two atoms on ADJACENT carbon atoms are removed, resulting in theformation of a double BOND. Preparations include the dehydration of ALCOHOLS, the DEHYDROHALOGENATION of alkyl halides, and the dehalogenation of alkanes.

s SULPHUROUS acid.H2SO3

s your question MR by the way KEEP SMILING and PLZZ note ur question.

b1 (thiamine),sources are YEAST and liverdeficiency DISEASE is beriberivitamin B2 (riboflavin), sources are eggs and milkdeficiency disease is inflammation of the tongueHope it HELPS