Bio Ch.2 atom review

The space surrounding the nucleus of an atom contains

• protons

• neutrons

• electrons

• ions

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number would be

• 3

• 4

• 7

• 11

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NGSS.MS-PS1-1

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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NGSS.MS-PS1-1

Which of the following is a use of radioactive isotopes?

• to determine the ages of rocks and fossils

• to treat cancer and kill bacteria that cause food to spoil

• to be used as "tracers" to follow the movements of substances within organisms

• all of the above

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

• 1

• 11

• 12

• 23

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS1-1

Which of the following statements about a compound is true?

• the physical and chemical properties of a compound are usually very different from those of the elements from which it is formed

• only the physical properties of a compound are usually the same as those of the elements from which it is formed

• only the chemical properties of a compound are usually the same as those of the elements from which it is formed

• the physical and chemical properties of a compound are usually the same as those of the element from which it is formed

A covalent bond is formed as a 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

• possible positive or negative

The most abundant compound in most living things is

• carbon dioxide

• water

• sodium chloride

• sugar