Question

Arrange these elements in order of decreasing atomic radius. Briefly explain your answer.

Answer 1

Answer:

the least reactive metal among the following

Answer 2

Answer:

atomic radius decreases across a period because similar number of shells bit one electron and proton is added by successive element. So the force of attraction between the nucleus and the outermost shell increases. So atomic radius decreases.

Similarly , down a group atomic radius increases because a new shell is added. here by it increases the atomic radius.

By this we can solve the question.

Ca,mg,p,cl.

In these mg ,p,cl are present in third period. But Ca is present in fourth period.

So,Ca has the highest atomic radius.

Then mg is bigger.then p. And last is cl.

Ca>mg>p>cl.

Explanation:

I hope it is helpful