.I NEED HELP
__________ are composed of two or more covalently bonded atoms.
a. Elements
b. Molecules
2.
A(n) ___________ is the basic building block of matter and is composed of protons, neutrons, and electrons.
a.Atom
b. Molecule
3.
__________ can be both an atom and a molecule.
a. Hydrogen
b.Helium

Respuesta :

B molecules or atom
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