(a) Complete the table.

(b) Classify the elements given in the table as metals and non-metals.

(c) To which group does sodium belong? Why is Hydrogen not considered while describing the elements of this group?

Assertion (A): Noble gases do not combine with other elements.

Reason (R): The outermost orbit of noble gases are complete, they have a stable electronic configuration.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Chlorine with atomic number 17 is placed in group 17 and period 3.

Reason (R): The number of shells signifies a period, while the number of valence electrons indicates the group.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): ¹⁹Fluorine, ³⁵Chlorine and ⁸⁰Bromine do not constitute a Döbereiner's triad.

Reason (R): Atomic mass of chlorine is not the average mass of Fluorine and Bromine.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.