Apologia Physical Science Module 3 Study Guide

The sum of the protons and neutrons in the nucleus of a cell.

• Atomic number

• Mass number

• Number

Atoms of an element with the same number of protons but different numbers of neutrons.

• Orbitals

• Isotopes

• Mixtures

Matter cannot be created or destroyed, but it can change forms.

• Law of Constant Composition

• Law of Conservation of Mass

• Newton's Third Law of Thermodynamics

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Electrons that are in the highest energy level of an atom

• Important electrons

• Valence electrons

• Energetic electrons

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Samples of a pure compound always have the same elements in the same mass proportions

• Law of Conservation of Mass

• Law of Constant Composition

• Law of Mass Proportions

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The number of ____ in an atom is the atomic number.

• electrons

• protons

• neutrons

A region of space around the nucleus where electrons are most likely to be found.

• Rings

• Orbitals

• Pipe cleaners

Where is almost all of the mass of an atom found?

• protons

• neutrons

• electrons

• nucleus

What type of particle is an electron?

• a negative charge, found in the nucleus

• a negative charge, found outside the nucleus

• a positive charge, found outside the nucleus

• no charge, found outside the nucleus

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All atoms of an element have the same

• number of isotopes

• atomic number

• mass number

• number of neutrons