Atomic number is the number of protons in a atomic number.

The period table is a table of chemical elements

EX:320          3..20x10

same elements and different mass

+ POsitive Charge

Has no mass And is found outside of the nucle

is the total numbers of protons

element number is the number of protons in the atomic 

alkali number are located in the left side of the period tabel

\\NOble gases are located to the left side of the periodic table.