The symbol of magnesium is mg and iron is Ir
Scientists will often use a(n) _________________, an object that helps explain ideas about the natural world.
The answer is model.
As the atomic radius decreases, it becomes harder to remove an electron that is closer to a more positively charged nucleus. They experience a weaker attraction to the positive charge of the nucleus. Ionization energy increases from left to right in a period and decreases from top to bottom in a group.
