Podaj symbol i nazwę pierwiastka z grupy głównej którego atomy posiadają 4 powłoki i na zewnętrznej powłoce 6 elektronów

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

use quiz let it tells you all the answers thats what i use