Question

how does atomic radius change from left to right across a period in the periodic table?it tends to increase.it first decreases, then increases.it tends to decrease.it first increases, then decreases.question 2 2.5 ptshow does atomic radius change from top to bottom in a group in the periodic table?it tends to increase.it first increases, then decreases.it tends to decrease.it first decreases, then increases.

Explanation:

• For the first question:

As we move from left to right across a period in the periodic table, the number of protons in the nucleus increases (nuclear charge increases). The electrons are added to the same principal energy level. The increased nuclear charge pulls the electrons closer to the nucleus. So, the atomic radius tends to decrease.

• For the second question:

When moving from top to bottom in a group in the periodic table, new electron shells are added. The outermost electrons are farther from the nucleus as the number of electron shells increases. So, the atomic radius tends to increase.

Answer:

1. It tends to decrease.
2. It tends to increase.