Question

as the atomic number increases in group 2 from be to ba, the first ionization energy

1. decreases, and the atomic radius decreases
2. decreases, and the atomic radius increases
3. increases, and the atomic radius decreases
4. increases, and the atomic radius increases

Explanation:

As atomic number increases down Group 2 (Be to Ba), new electron shells are added, so atomic radius increases. The outermost electrons are farther from the nucleus and experience more shielding, making them easier to remove, so first ionization energy decreases.

Answer:

1. decreases, and the atomic radius increases