How does the atomic radius change from top to bottom in a group 1 and 2 in the periodic table?

Answer 1

Going down and to the left on the Periodic Table, atomic radius increases. Therefore, the smallest atomic radius is that of Helium (He), and the largest is that of Francium (Fr). Coincidentally, these are also the most and least reactive elements.

Answer 2

The atomic radius trend goes as follows:

• From top to bottom, the atomic radius increases (there are more energy levels with each row)
• From left to right, the atomic radius decreases (the addition of protons will increase the effective nuclear charge, bringing the electrons closer to the center)

Answer 3

It tends to increase
The atomic radius increases down the group

Answer 4

The atomic radius increases on going from the top to the bottom of a group as the number of shells (energy levels) increases.

Answer 5

The lower down on the periodic table the higher the energy level, making the atomic radius larger

Answer 6

Atomic radius increases with increasing period number (= going down) within the same group.

Answer 7

down the group, the atomic radius increases as the shell (or energy level) increases.

Answer 8

It increases!

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Answer #2:

It decreases.