Chemistry Review

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

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Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom. The number of protons determines the element's identity.

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Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom. They contribute to the atomic mass but do not affect the charge.

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Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom. They are involved in chemical bonding.

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Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons. It is positively charged due to the presence of protons.

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Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of an element in a molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

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Front

How do you determine the number of electrons in a neutral atom?

Back

In a neutral atom, the number of electrons is equal to the number of protons.

Front

What is the atomic number?

Back

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

Front

What is the mass number?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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