Question

22 deduce whether the following state is true or false. group 1 is also known as the alkaline earth metals. (0.5 points) true false 23 the attraction between the nucleus and the outer valence shell is responsible for the periodicity of atomic radius, ionisation energy, electron affinity and electronegativity. (0.5 points) true false

Explanation:

• For question 22: Group 1 elements are called alkali metals, while Group 2 elements are alkaline - earth metals.
• For question 23: The periodicity of atomic radius, ionisation energy, electron affinity and electronegativity is mainly due to the attraction between the nucleus and the outer valence shell electrons and the shielding effect.

Answer:

1. B. False
2. A. True