Question

c) Give Reasons:
i) The physical properties of isotopes are different.
ii) Hydrogen is kept in IA group of period table.
iii) Why sodium is kept in kerosene
iv) Define chemical bond

please reply back fast...
the one with correct answer and the one who answer's fast would be given as brainliest....
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Answer 1

Explanation:

1.Isotopes of the same element have different physical properties (melting points, boiling points) and the nuclei of some isotopes are unstable and radioactive.

2.Hydrogen is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. ... Because hydrogen is a nonmetal and forms H- (hydride anions), it is sometimes placed above the halogens in the periodic table. Hydrogen also forms H2 dihydrogen like halogens.

3.Sodium is a very reactive metal. It is kept in kerosene to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and form sodium hydroxide. This is a strongly exothermic reaction, and lot of heat is generated.

4.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 2

Answer:

1. Because isotopes have different number of neutrons , which affects the mass number . Mass number determines the physical properties such as boiling , melting,density,etc..
2. Hydrogen is placed above group in the periodic table because it has NS1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals. Hydrogen is less electro negative than the halogens.
3. Sodium is a very reactive metal. It is kept in kerosene to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and form sodium hydroxide. This is a strongly exothermic reaction, and lot of heat is generated.
4. A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons -or electrostatic forces.