Science Chapter 2 Test

The number of protons specifies an atom as a particular element

the sum of protons and neutrons

atoms of the same element that have different numbers of neutrons

electrically charged atoms

Electrons occupy this region of space. Where an electron is present most of the time

a form of attraction between atoms that holds them together

This results when 2 atoms share electrons. Each shared pair of electrons constitutes this, which holds atoms together.

the merged orbital

the electrons farthest from the nucleus - those in the outermost orbitals of an atom. the highest energy level of the atom

groups of two or more atoms attached together that act as a single unit