Atoms, Compounds, Elements, and Molecules

This is the smallest unit of an element.

• atom

• molecule

• compound

• nucleus

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Any combination of two or more atoms that are chemically combined is called this.

• molecule

• compound

• element

• pure substance

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This is any combination of two or more atoms from different elements that are chemically combined.

• compound

• molecule

• element

• pure substance

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The basic building blocks of the universe. The smallest and most pure substances that can be found.

• elements

• atoms

• molecules

• compounds

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This is what holds atoms in a molecule and compound together. They can be ionic, covalent, or metallic (and you'll learn about these in high school chemistry).

• chemical bond

• chemical formula

• chemical symbol

• electron cloud

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These are what determine the properties of every atom and make one element different from another. They have a positive charge (yes, I'm positive that it's a positive charge).

• protons

• electrons

• neutrons

• nucleus

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These hang out in the nucleus and don't really affect the properties of the atom that much. They don't have any charge (so they can't use credit cards).

• neutrons

• protons

• electrons

• atomic numbers

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These are what form chemical bonds as atoms share or take them from one another. They orbit the nucleus and have a negative charge (but they are still happy about things in general).

• electrons

• electron clouds

• protons

• neutrons

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This is the central region of an atom and where protons and neutrons hang out (but the protons and neutrons still follow proper social distancing rules!).

• nucleus

• electron cloud

• The Periodic Table of Elements

• atomic number

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This is a list of the 118 known elements that exist (and a picture of it is on this quiz!).

• The Periodic Table of Elements

• The Student Faculty Handbook

• Facebook

• Wikipedia

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