Which of the following statements is/are true or false?

Statements:

A) On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases.

B) The chemical reactivity of non-metals increases on going down in a group of the periodic table.

Question

Question

This question was previously asked in

RRB ALP CBT I 29 Aug 2018 Shift 2 Official Paper

Answer 1

The correct answer is Statement A is true, but B is false

Key Points

Chemical reactivity refers to how likely an atom is to react with other substances.
There are a few characteristics that denote the periodic trend across the group in the periodic table such as Electronegativity, Ionization energy, Electron affinity, Chemical reactivity etc.
When we move from left to right across a period, the chemical reactivity of elements decreases and then increases.
For metals, the chemical reactivity increases down the group and then decreases.
- But for non-metals, the chemical reactivity decreases and then increases. Hence option 2 is correct.

Additional Information

Ionization energy is the energy required to remove an electron from an isolated gaseous atom in its ground state.
- It increases from left to right across the period.
Electronegativity is the tendency of an atom in a molecule to attract the shared pair of electrons towards itself.
- Fluorine (Fl) has the highest Electronegativity.
Electron affinity is the amount of energy released when an electron is added to a neutral atom to form an anion.
- Chlorine (Cl) has the highest Electron affinity.