Atoms and the Periodic Table

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What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

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What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

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What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

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What are electrons?

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Electrons are negatively charged particles that orbit the nucleus of an atom.

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What is the atomic number?

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The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

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What is atomic mass?

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Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What is the Periodic Table?

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The Periodic Table is a tabular arrangement of elements organized by increasing atomic number and grouped by similar properties.

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What are groups in the Periodic Table?

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Groups are the vertical columns in the Periodic Table that contain elements with similar chemical properties.

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What are periods in the Periodic Table?

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Periods are the horizontal rows in the Periodic Table that indicate the number of electron shells in the elements.

Front

How do you calculate the number of neutrons in an atom?

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Number of neutrons = Atomic mass - Atomic number.