What is a neutron?

6. What happens when a substance changes from a gas to a liquid?

How are electrons arranged in atoms?

What is a valence electron?

Which characteristic of an atom determines how it will react chemically with other elements and compounds?

What is the difference between an element and a compound?

The positively charged part of the atom is the ___.

Reactivity of an atom is based on its __.

A valence electron is located

5. The atomic number of an atom is equal to

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