Atomic Structure and Chemical Bonds

What is the basic unit of chemical elements?

• Molecules

• Compounds

• Atoms

• Mixtures

Where are protons and neutrons found within an atom?

• In the electron cloud

• In the nucleus

• In the shells

• Outside the atom

What type of electrical charge do protons carry?

• Negative charge

• No charge

• Positive charge

• Variable charge

Why are atoms considered electrically neutral particles?

• They have no subatomic particles.

• They have an equal number of protons and electrons.

• They only have neutrons.

• They have more electrons than protons.

What are the paths or regions where electrons orbit the nucleus called?

• Nuclei

• Protons

• Energy levels

• Neutrons

Which electrons are involved in forming chemical bonds between atoms?

• All electrons in the atom

• Only electrons in the innermost shell

• Only electrons in the nucleus

• Only electrons in the outermost shell

For atoms with only one energy level, how many electrons are typically needed in that level for stability?

• One

• Two

• Eight

• Ten

Why is Helium considered a stable element?

• It has no protons.

• Its first electron shell is full with two electrons.

• It has eight electrons in its outer shell.

• It easily forms compounds.