What is this element's atomic number?

Atomic number is the number of ___ in the nucleus of an atom.

What is this element's name?

a tree is an example of...

sound is an example of...

A water molecule is an example of...

Sunlight is an example of...

Anything that has mass and takes up space is ...

An area of land that separates waters flowing into rivers is...

A divide that separates river systems that flow to opposite sides of a continent is...

A very small particle that makes up all matter is...

The arrow is point to a(n)...

An electron has a ___ charge.

The arrow shows which atomic particle?

A neutron has ___ charge.

The arrow shows which atomic particle?

The word potable means...

The word contaminant means...

How many atoms does this chemical formula have? FeS₂

How many atoms does this chemical formula have? CO₂

How many atoms does this chemical formula have? CH₄

How many atoms does this chemical formula have? NaCl

The atomic number is always...

Is this an atom or a molecule? H₂O

Is this an atom or a molecule? Na

Is this an atom or a molecule? O₂

Two or more atoms bonded together make a(n) ...

The number of ___ determines the size of a molecule.

The smaller the atomic number, the...

If you want to filter out bacteria you would...

If you want to filter out protozoa (amoeba) you would...

If you want to filter out dissolved salts you would...

If you want to filter out most chemicals you would...

If you want to filter out viruses you would...