Review: Module 3 - Model of Matter

What are the three main subatomic particles that make up an atom?

• protons, electrons, ions

• protons, neutrons, electrons

• neutrons, electrons, molecules

• protons, neutrons, issotopes

Which of the following subatomic particles is positively charged?

• electron

• neutron

• proton

• ion

Where are electrons located in an atom?

• in the nucleus

• outside the nucleus in shells

• mixed with protons

• at the center of the atom

Why are atoms electrically neutral?

• They have no charge.

• They have equal number of protons and neutrons.

• They have equal number of protons and electrons.

• They have more neutrons than protons.

Which atom has 8 protons?

• Carbon

• Nitrogen

• Fluorine

• Oxygen

Describe the size relationship between an atom's nucleus and the overall atom.

What is an ion?

• An atom with equal protons and electrons.

• An atom that has gained or lost electrons.

• An atom with no charge.

• Two atoms bonded together.

If a sodium atom (11 protons) loses one electron, what is its charge?

• -1

• 0

• +1

• +2

What is a cation?

• a negatively charged ion

• a neutral atom

• an atom with extra neutrons

• a negatively charged ion

Which of the following atoms is an isotope?

• Na⁺

• Carbon

• Br^-

• U-235