Answer:hydrogen(H) is 1 and helium(He) is 2
hydrogen is a nonmetal and helium is a nobel gas. hydrogen is found in group S and helium is found in group P
Explanation:hope this helps
wavelenghts are lengths. they are measured in distances.
Plate Tectonics is the theory that earths outer shell is divided into several plates that glide over the mantle.
Al atom has 13 protons, 13 electrons.
Mass number = number protons + number neutrons
27 = 13 + number neutrons,
number neutrons =27 - 13 = 14 neutrons .
Ion Al³⁺, lost 3 electrons.
So, in Al³⁺, 13-3=10 electrons.
So, ion Al³⁺ has 13 protons,14 neutrons, 10 electrons.
