Question

question 7 of 25
what periodic trend does the atomic radius follow?
a. it decreases from top to bottom.
b. it increases from left to right.
c. it decreases from left to right.
d. it stays the same across the table.

Explanation:

Step1: Recall atomic radius trend

Atomic radius trends are based on electron - shell and effective nuclear charge.

Step2: Analyze vertical trend

As we move from top to bottom in a group, new electron shells are added, increasing atomic radius.

Step3: Analyze horizontal trend

As we move from left to right across a period, the number of protons increases (increasing effective nuclear charge) and electrons are added to the same shell, pulling electrons closer and decreasing atomic radius.

Answer:

C. It decreases from left to right.