Which of these statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens is correct?

easyMCQAIEEE 20062026Chemistry

1 attempts0% success rate1 mark

Which of these statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens is correct?

A $The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group$
B $In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group$
C $Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens$
D $In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group$

Solution & Step-by-step Explanation

- Alkali metals: Reactivity depends on the ease of losing an electron. Ionization energy decreases down the group, so reactivity increases.Halogens: Reactivity depends on the ease of gaining an electron. Electron affinity and electronegativity generally decrease down the group, making it harder to gain an electron. So reactivity decreases.

Try it yourself before checking the explanation above.

Which of these statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens is correct?

The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group

In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group

Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens

In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Practice with timed mock tests and track your performance across Chemistry.