Question

Order the following elements from smallest to largest in size, smallest to largest ionization energy, and smallest to largest electron affinity, based on the trends only.

a. Al, Na, S, Mg

b. C, Sn, Pb, Si

c. K, Se, Ca, Br

d. O, Se, S, Ne

Answer 1

a. Al, Na, S, Mg

S<Al<Mg<Na increasing order of size

Na<Mg<Al<S increasing order of ionisation

Na<Mg<Al<S increasing order of electron affinity.

b. C, Sn, Pb, Si

C<Si<Sn<Pb increasing order of size.

Pb<Sn<Si<C increasing order of ionisation

Pb<Sn<Si<C increasing order of electron affinity.

c. K, Se, Ca, Br

Br<Se< Ca<K increasing order of size.

K<Ca<Se<Br increasing order of ionisation energy.

K<Ca<Se<Br increasing order of electron affinity.

d. O, Se, S, Ne

O<S<Se<Ne increasing order of size

Se<S<O<Ne increasing order of ionisation energy

Ne<Se<S<O increasing order of electron affinity.