Did an ion that consists of 24 protons, 30 neutrons, and 22 electrons gain 2 protons or lose 2 electrons for the difference of 2?

How many oxygen atoms are in the compound Ca(MnO4)2?

Match the definition with the state of matter.

What is the chemical symbol for rubidium?

How many valence electrons are in an atom of magnesium in the ground state?

Which is a chemical change?

One isotope of carbon has the atomic number 6 and the mass number 14.  An atom of this isotope contains:

What is the correct name for CuCl2?

Which is a transition element/metal?

A simple statement of natural phenomena to which no exceptions are known under given conditions is a(n):