Matter is anything that has...

Density is...

The building blocks of all matter are...

On the periodic table, an element's atomic mass is made of...

A chemical change takes place when

Which of these is an example of a chemical change?

The electrons in the outermost cloud of an atom that determine whether an atom will combine with another to form a compound are called

When sodium combines with chlorine to form salt, sodium loses an electron and chlorine gains an electron. Each separate atom is now called a what?

Argon is an element that has an atomic number of 18. It has an atomic mass of 40. How many neutrons are there in Argon?

Which of these is NOT a compound?

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