What happens to the radius as you move down Group 1?

Group 1 elements are known as Alkali Metals. They are called s-block elements because their highest energy electrons appear in the s subshell. Progressing down group 1, the atomic radius increases due to the extra shell of electrons for each element. Going down the group, the first ionisation energy decreases.

Why does atomic radius increase down a group but decrease across a period?

Covalent radius increases as we move down a group because the n level (orbital size) increases. Covalent radius mostly decreases as we move left to right across a period because the effective nuclear charge experienced by the electrons increases, and the electrons are pulled in tighter to the nucleus.

Why does atomic radius increase?

The gain of an electron adds more electrons to the outermost shell which increases the radius because there are now more electrons further away from the nucleus and there are more electrons to pull towards the nucleus so the pull becomes slightly weaker than of the neutral atom and causes an increase in atomic radius.

Why does atomic radius increase from left to right?

On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group (due to the increasing number of electron shells).

Why does atomic radius decrease from left to right?

Atomic Radius to right in a radius decreases while going from left to right in a period. This is because when we move left to right in a period atomic number increases thus the valence electron feels more attraction towards the nucleus. thus size decreases.

Why the atomic size increases as we move from left to right in a period in periodic table?

(a) As we move from left to right across the period, atomic size decreases as atomic number increases. The number of protons and electrons increases and due to the large positive charges on the nucleus, the electron is pulled inside more closer, and thus the size of the atom decreases.

Why does the atomic radius decrease as you move from left to right across a period?

Atomic radius patterns are observed throughout the periodic table. Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.