What is the basic unit of matter?

The atomic number of an element is equal to:

Isotopes of an element have different numbers of:

Metals typically are:

Which family is known for being very stable and unreactive?

How many valence electrons does an Oxygen atom have?

How many protons does Chlorine have?

Which of the following is not a physical change?

The direct change from a solid to a gas is known as:

What state of matter has a definite volume, but takes the shape of its container?

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