Question

1. choose the best answer.

atomic radi down each group and generally ________ across each period.

1. choose

lonization en down each group and ________ across each period.

Explanation:

Step1: Recall atomic radius trends

In the periodic table, as we move down a group, new electron shells are added. This increases the distance from the nucleus to the outermost electrons, so atomic radius increases.

Step2: Recall atomic radius trends across a period

Across a period, the number of protons (positive charge) in the nucleus increases. The electrons are added to the same shell. The increased nuclear charge pulls the electrons closer to the nucleus, so atomic radius decreases.

Answer:

Atomic radius increases down each group and generally decreases across each period.