______ is an example of an element.

The four most common elements found in living things are

Which of the following elements, essential to life, is a trace element?

An atom with a positive charge has ______.

All atoms of an element have the same number of ______.

An atom's ______ are found in its nucleus.

Beryllium's atomic mass is 9 and its atomic number is 4. How many neutrons are found in a beryllium atom?

The way Earth moves about the sun is most like ______.

Isotopes of an element have the same number of ______ and different numbers of ______.

How do radioactive isotopes differ from isotopes?

The second electron shell of an atom can hold a maximum of ______ electron(s).

Nitrogen has an atomic number of 7; therefore, it has ______ electrons in its outermost electron shell.

An atom with an electrical charge is a(n) ______.

The bond between oppositely charged ions is a(n) ______ bond.

What name is given to bonds that involve the sharing of electrons?

Why is water considered a polar molecule?

The hydrogen atoms and oxygen atom of a water molecule are held together by ______ bonds.

Adjacent water molecules are joined by ______ bonds.

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