Question

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Answer 1

Answer:

a. chlorine

b. sulphur

c. Hydrogen with valency ns1

3. Element properties are a periodic function of their atomic weight.

Explanation:

Hope this answer helps u

Answer 2

Answer:

a) Element A is non metal because it has atomic number 17 and it has valence shel electrons 7 so it has to accept one electron to get stable.

b)Because on going across the group size of electron decreases.

c)First you have to show it

such as POTASSIUM: 2,8,8,1

They belong to alkali metals and they have one electrons in their valence shells which they can donate to form stable atom.

3) It is in book

Explanation:

All explained