What happens to the atomic radius when an electron is lost

Answer : When an electron is lost then the atomic radius is, decreases.

Explanation :

Atomic radius of an atom is defined as the total distance from the nucleus to the valence shell of the atom.

As moving from left to right in a period, more electrons are added in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom.

Thus, atomic radii from the left to right across a period tend to decrease.

As moving from top to bottom in a group, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases.

Thus, atomic radii from the top to bottom in a group tend to increases.

When atom loses an electron then it becomes positively charged and the atomic radius of positively charged ion is lower than neutral atom.

When atom gains an electron then it becomes negatively charged and the atomic radius of negatively charged ion is more than neutral atom.

Hence, when an electron is lost then the atomic radius is, decreases.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the answer for sodium is 0.186

the answer for rubidium is 0.251