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

If the element whose electric configuration ends in the d sublevel, the element is calssified as? a.inner transition b.noble gases c.representative d. transition

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

In 2002, the rare earth elements mine in mountain pass, california was closed because