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3.1: Atoms to Molecules

Difficulty Level: At Grade Created by: CK-12
Atoms Practice
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Vocabulary

atom

The smallest unit of a chemical element.

atomic mass

The number of protons and neutrons in an atom.

electron

Tiny negatively charged particles that orbit the nucleus.

element

Pure chemical substance that cannot be broken down into other types of substances; consists of one type of atom.

isotope

A chemical element that has a different number of neutrons.

molecular mass

The sum of the masses of all of the atoms in a molecule.

molecule

The smallest unit of a compound; it is made of atoms.

neutron

A neutral particle in the nucleus of an atom.

nucleus

The center of an atom, made of protons and neutrons.

proton

A positively charged particle in a nucleus.

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Difficulty Level:
At Grade
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Date Created:
Feb 24, 2012
Last Modified:
Aug 15, 2016
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