Biology Chapter 2

The three particles that make up atoms are

• protons, neutrons, and isotopes.
• neutrons, isotopes, and electrons.
• positives, negatives, and neutrals.
• protons, neutrons, and electrons.

What are found in the space surrounding the nucleus of an atom?

• protons
• electrons
• neutrons
• ions

Subatomic particles are

• particles that are smaller than an atom.
• made up of a single atom.
• particles found beneath atoms.
• composed of several atoms.

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

• 3.
• 4.
• 7.
• 11.

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

• 1.
• 11.
• 12.
• 23.

Which of the following is a substance formed by the chemical joining of two or more elements in definite amounts?

• compound
• isotope
• nucleus
• enzyme

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

A covalent bond is formed as the result of

• transferring electrons.
• sharing electrons.
• transferring protons.
• sharing protons.

Which term does NOT apply to sodium chloride?

• molecule
• ionic bonding
• compound
• crystal

What type of electron is available to form bonds?

• valence
• nucleus
• ionic
• covalent