Molecule

What is the smallest part of an element?

• Atom

• Electron

• Molecule

• Compound

At least how many different atoms must a compound contain?

• Two atoms

• One atom

• Three atoms

• Four atoms

What is the smallest unit into which a substance can be divided without a change in its chemical nature?

• Electron

• Atom

• Proton

• Molecule

How many atoms does a molecule of water consist of?

• Two atoms of hydrogen and one atom of oxygen

• Two atoms of hydrogen and two atoms of oxygen

• One atom of hydrogen and two atoms of oxygen

• One atom of hydrogen and one atom of oxygen

What term is used to describe gases whose molecules contain only one atom?

• Diatomic

• Triatomic

• Tetraatomic

• Monoatomic

A molecule consists of a group of atoms, and it is the smallest unit into which a substance can be divided without a change in its chemical nature.

• True
• False

Gases like oxygen, hydrogen, nitrogen, and chlorine usually exist as single atoms when they are free.

• True

• False

Helium and neon gases prefer to remain alone, making them diatomic.

• False
• True

Although the atoms of elements take part in chemical reactions, they very often exist as single atoms when they are free.

• True

• False

Molecular structure is the way in which molecule is organized, built or put together.

• True

• False