Question

Looking at the Bohr models of atoms offer an explanation as to WHY the atomic size changes as it does for both periods and groups.

Periods:
Groups:

Answer 1

element 87 francium have the highest atomic size, so in short the closest element to francium have the high atomic size.

Answer 2

The atomic size of an atom change in both periods and group because of change in the number of electrons orbiting the nucleus of an atom.

Across the period: The atomic size of an atom decreases across the period because of increase in the number of electrons been pulled inwards due to the positively charged nucleus.

Across the group: The atomic size of an atom increases down the group because of increase in the number shells down the group.

Thus, we can conclude that the atomic size of an atom change in both periods and group because of change in the number of electrons orbiting the nucleus of an atom.

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