Compare the energy of an electron in the first electron shell to the energy of an electron in the second electron shell in an atom of isotope E.

In a chemical reaction at equilibrium, the rate of the forward reaction the rate of the reverse reaction. if the rate of the forward reaction more products are formed.

When the mercury level in a barometer decreases that atmospheric pressure has

An atomic nucleus is composed ofa)protons. b)protons and neutrons. c)protons and electrons. d)protons, neutrons, and electrons.