The structure of the periodic table is based on the distribution of a- protons b- electrons in each element. the elements are arranged in horizontal a- periods b- groups vertical a- periods b- groups

B- electrons, A- periods, B- groups

The correct answer is Option A, Option A and Option B.

Explanation:

Elements in a periodic table are distributed in 7 Periods and 18 Groups.

The elements are distributed on the basis of increasing atomic numbers. Atomic number is defined as the number of protons that are present in an element.

Thus, the elements in the periodic table are distributed based on the distribution of protons.

The elements are arranged in vertical columns known as Groups and in horizontal rows known as Periods.

Hence, the correct answer is Option A, Option A and Option B.

thats how its supposed to be