Question

How does number of shells vary from left to right in a period?

Answer 1

Answer:

On the periodic table, elements that have similar properties are in the same groups (vertical). From left to right, the atomic number (z) of the elements increases from one period to the next (horizontal). The groups are numbered at the top of each column and the periods on the left next to each row

Answer 2

Answer:

the number of shells remains the same but the atomic radius decreases due to nuclear force of attraction and the electrons in the shell increases as we move from left to right in a period