Atoms and Bonding

What is the basic unit of an element?

• cell

• atom

• molecule

• proton

How many protons are present in the nucleus of an atom?

• Zero

• One

• Two

• Three

What is the charge of an electron?

• -1

• 0

• 1

• 2

Explain the structure of an atom.

• The structure of an atom consists of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or shells.

• The structure of an atom consists of a nucleus containing electrons and protons, surrounded by neutrons in orbitals.

• The structure of an atom consists of a nucleus containing electrons and neutrons, surrounded by protons in energy levels or shells.

• The structure of an atom consists of a nucleus containing electrons and protons, surrounded by neutrons in energy levels or shells.

What is a covalent bond?

• The transfer of electron pairs between atoms

• The attraction between positive and negative ions

• The sharing of electron pairs between atoms

• The repulsion between atoms

Give an example of a covalent compound.

• Carbon dioxide (CO2)

• Sodium chloride (NaCl)

• Water (H2O)

• Hydrochloric acid (HCl)

What is an ionic bond?

• A bond that involves the attraction between two nonpolar molecules

• A chemical bond that involves the electrostatic attraction between oppositely charged ions.

• A bond that results from the transfer of protons between atoms

• A bond formed by sharing electrons between atoms

How do atoms form ionic bonds?

• By absorbing photons from the environment

• By releasing neutrons from the nucleus

• By transferring electrons from one atom to another

• By sharing protons between atoms

What are atoms?

• Atoms are the basic building blocks of matter.

• Atoms are made of water and air.

• Atoms are only found in living organisms.

• Atoms are not important in understanding the universe.

Explain how atoms can bond.

• Atoms bond by repelling each other

• Sharing, gaining, or losing electrons

• Atoms bond by forming covalent bonds

• Atoms bond by sharing protons