What atom is represented by this Bohr diagram?

M

It's a Lithium atom

Explanation:

You can count the red particles in the nucleus, they're the protons. This atom have 3 protons. The atom that have 3 protons is the Lithium atom

Looks like lithlithium

Explanation:

A lithium atom is an atom of the chemical element lithium. Lithium is composed of three electrons bound by the electromagnetic force to a nucleus containing three protons along with either three or four neutrons, depending on the isotope, held together by the strong force.

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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.