Which chemical formula represents the hydroxide ion?

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

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.