Which of the following is true of neutrons?
They have a charge and a mass about the same as that of an electron.
They have no charge and a mass about the same as that of a proton.
What determines the atomic number of an element?
the number of neutrons it has
the number of protons and neutrons it has
the number of protons it has
A covalent bond:
is always polar
may be polar or nonpolar depending on the atoms involved
always forms between identical molecules
