Science Mid-Term Review

Front

How do you find the number of Neutrons in an atom?

Back

Subtract the atomic number from the mass number (M - A = N).

Front

What does it mean for an atom to be stable or non-reactive?

Back

An atom is stable or non-reactive if its outer shell of valence electrons are all paired up (has an 'Octet').

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Front

What occupies most of the volume of an atom?

Back

The electron cloud occupies most of the volume or 3-Dimensional space of an atom.

Front

How do you calculate the mass of an atom?

Back

Add together the number of protons and neutrons.

Front

What particles determine how reactive an atom is?

Back

Electrons determine how reactive an atom is.

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Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that determine its chemical properties.

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Front

What is an ion?

Back

An ion is an atom that has gained or lost one or more electrons, resulting in a net charge.

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Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.