Question

The following table represents the elements and atomic number. With reference to this, answer the following using only the alphabets given in the table.

Element	Atomic number
P	13
Q	7
R	10

1. Which element combines with hydrogen to form a basic gas?
2. Which element has an electron affinity zero?
3. Name the element which forms an ionic compound with chlorine.

Answer 1

1. Q combines with hydrogen to form a basic gas.
2. R has an electron affinity of zero as its octet is complete, and it is a stable element.
3. P forms an ionic compound with chlorine as it has +3 valency.