Chemistry Chapter 2

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chapter 2...

Last updated 8:57 PM on 7/21/26
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8 Terms

1
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Matter

Anything that has a mass, volume, and occupies space.

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Element

A pure substance that cannot be broken down into simpler substances by a chemical reaction.

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Atoms

Matter composed of the same base building blocks

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How to calculate the Mass number?

Atomic number + neutrons

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Valance electrons

the number of electrons in the outermost shell

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Lewis structure

Shows the number of valance electrons in an element

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Isotopes

atoms of the same element that have a different number of neutrons

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Molar mass

one mole equals the atomic weight of that element in grams