Question

Why and how elements are arranged in 4th period of periodic table?

Answer 1

Answer:

Elements are arranged from left to right and top to bottom in order of increasing atomic number.

The number of electrons in a period increases as one moves down the periodic table; therefore, as the energy level of the atom increases, the number of energy sub-levels per energy level increases.

Answer 2

Answer:

I am also thinking s same as Tejas 0402