Give one word or phrase for : The tendency of an atom to attract electrons to itself when combined in a compound.

The question represents the elements P, Q. R and their atomic numbers.

Answer the following using only the alphabets given — P = 13; Q = 7; R = 10

(i) Which element combines with hydrogen to form a basic gas.

(ii) Which element has an electron affinity zero.

(iii) Name the element, which forms an ionic compound with chlorine.

In the Periodic Table, elements of Period 3 are arranged in the increasing order of ionization potential as:

1. B, N, CI, Ar
2. Mg, Si, S, Ar
3. Ar, Si, S, Mg
4. Si, Ar, Cl, Mg

The tendency of an atom to attract shared pair of electrons to itself when forming a chemical bond is known as

1. Electron affinity
2. Electronegativity
3. lonization potential
4. Nuclear charge