BIOCHEMISTRY STUDY GUIDE

The three particles that make up atoms are

• protons, neutrons, and isotopes.

• neutrons, isotopes, and electrons.

• positives, negatives, and electrons.

• protons, neutrons, and electrons.

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The space surrounding the nucleus of an atom contains

• protons.

• electrons.

• neutrons.

• ions.

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Democritus believed that atoms

• were composed of electrons.

• were composed of protons.

• could be divided.

• could not be divided.

The nucleus is made up of

• protons and electrons.

• electrons and neutrons.

• protons and neutrons.

• protons, neutrons, and electrons.

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Isotopes are atoms of the same element with the same number of protons and

• a different number of electrons.

• a different number of molecules.

• a different number of neutrons.

• the same number of neutrons.

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If an atom contains 11 protons and 12 neutrons, its atomic number is

• 1.

• 11.

• 12.

• 23.

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Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?

• compound

• isotoped

• nucleus

• enzyme

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Which of the following makes up a molecule of water?

• one atom of hydrogen and one atom of oxygen

• one atom of sodium and one atom of chlorine

• one atom of hydrogen and two atoms of oxygen

• two atoms of hydrogen and one atom of oxygen

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NGSS.MS-PS1-1

A covalent bond is formed as the result of

• transferring electrons.

• sharing an electron pair.

• transferring protons.

• sharing a proton pair.

What type of ion forms when an atom loses electrons?

• neutral

• positive

• negative

• possibly positive or negative