If you are trying to measure an electric current and need to describe the quantity
and units, how will you describe the units?

Usually you have V, for voltage, Ohms for resistance, and Coulombs for charge.

Explanation:

See the image attached :)

the atomic mass is the bottom number on the element.

-steel jelly

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.