Question

Name the following :
(i) The valency of the element in period 3 having atomic number 17.
(ii) The term for a group of atoms of elements that behaves as a single unit
and shows a valency.
(iii) The group whose elements have zero valency.
(iv) The law which explains that matter can be neither created nor destroyed in
the course of a chemical reaction.
(v) The term which is defined by the number of times one atom of an element
is heavier than 1/12th the mass of an atom of carbon.

Answer 1

Explanation:

1.1 is valency

2.radical

3.8

4.law of conservation of mass

5.relative atomic mass

Answer 2

valency

radical

8

conservation of mass

relative atomic mass