An atom of fluorine has nine electrons. Its second energy level has _________ electrons.

Which is the negatively charged particle located outside the nucleus of an atom?

Which particle in the nucleus of an atom has a neutral charge?

If an atom has 7 electrons, how many are located in the second energy level?

In the periodic table of the elements, elements in Group 1 have how many outer electrons?

One isotope of carbon differs from another in which way?

Which is the best description of activation energy?

Which cannot take place during a chemical reaction?

What principle can be applied to all chemical reactions?

How many different kinds of atoms does an element contain?

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