​Electrons (e-) have a negative charge

Protons (p) have a positive charge

Neutrons do not have a charge​

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The nucleus of the atom contains the neutrons and protons.

The nucleus is surrounded by orbiting electrons.​

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The whole number, usually located in a corner is the atomic number. It represents the number of protons​

The other number, usually followed by several places beyond the decimal, is the atomic mass.​

Basic information from the periodic table:​

Reading the Periodic Table

In a covalent bond a e- is shared between atoms. This is the strongest bond.​

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Covalent Bond

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In an ionic bond, an atom transfers an e- to another atom.

This is the second strongest bond.​

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Ionic Bond

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In a hydrogen bond, the partially positive and partially negative poles of an atom are attracted to each other like a magnet.​ These bonds include a hydrogen

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Hydrogen Bond

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These bonds are between a negatively charged and positively charged pole. This is the weakest charge.​

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​van der Waals

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