Basic Electricity Concepts

What is the smallest unit of matter that has the characteristic properties of a chemical element?

• Molecule

• Atom

• Proton

• Electron

What is the smallest unit into which matter can be divided without releasing electrically charged particles?

• Molecule

• Atom

• Proton

• Neutron

Match each part of the atom with its correct description.

• The central part of the atom containing protons and neutrons.

• Proton

• A positively charged particle found in the nucleus.

• Electron

• A negatively charged particle found in the electron orbit.

• Electron Orbit

• The region where electrons are likely to be found orbiting the nucleus.

• Nucleus

Which subatomic particle orbits around the nucleus of an atom?

• Proton

• Neutron

• Electron

• Nucleus

Which subatomic particles are found inside the nucleus of an atom?

• Electrons and Protons

• Protons and Neutrons

• Neutrons and Electrons

• Protons and Electron Orbits

What percentage of the atom's mass is represented by the nucleus?

• 50%

• 75%

• 99.99%

• 100%

The charge of a proton is (a)  

• Neutral charge
• Positive (+) charge
• Negative (-) charge
• No charge

What is the charge of a neutron?

• Positive (+) charge

• Negative (-) charge

• Neutral charge

• No charge

The nucleus of an atom is made of (a)   .

• Electrons and protons
• Protons and neutrons
• Neutrons and electrons
• Electrons only

What is the smallest subatomic particle in an atom?

• Proton

• Neutron

• Electron

• Nucleus