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.

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.