Chemistry Concepts

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Compound

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Made up of two or more elements that are chemically bonded. Compounds are pure chemical substances. A new substance is formed when they chemically bond. Examples include H₂O, MgBr₂, CH₄, C₆H₁₂O₆.

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Protons

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Have a positive charge. The atomic number on the periodic table tells us the number of protons. Protons are found in the nucleus of an atom.

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Electrons

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Have a negative charge. The number of electrons is always the same as the number of protons. Electrons orbit around the atom, outside the nucleus.

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Neutrons

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Have no charge (are neutral). The number of neutrons can be calculated by subtracting the Atomic Number from the Atomic Mass. Neutrons are found inside the atom's nucleus.

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Atomic Number

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The atomic number indicates the number of protons in an atom.

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Example of a Compound

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H₂O, MgBr₂, CH₄, C₆H₁₂O₆ are examples of compounds.

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Physical Combination in Mixtures

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Mixtures are physically combined and can be separated.

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Neutrality of Elements

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Elements are always neutral, consisting of protons, neutrons, and electrons.

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Protons in the Nucleus

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Protons are located in the nucleus of an atom.

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Neutrons in the Nucleus

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Neutrons are found inside the atom's nucleus.