California Experience Chemistry Quiz

What part of the atom contains the protons and neutrons?

• Electron cloud

• Nucleus

• Orbital

• Energy levels

Which subatomic particle has a negative charge and orbits the nucleus?

• Proton

• Neutron

• Electron

• Positron

What is the mass number of an atom with 15 protons and 16 neutrons?

• 15

• 16

• 31

• 1

If an atom is neutral, how many electrons are in an atom with 10 protons?

• 9

• 10

• 11

• 20

An isotope of carbon has 6 protons and 8 neutrons. What is its mass number?

• 12

• 14

• 6

• 8

Draw and label a nuclear model of the atom. Describe the roles of the protons, neutrons, and electrons within the atom.

Explain the difference between an isotope and an ion. Provide an example of each.

In a neutral atom, how does the number of protons relate to the number of electrons? What would happen if the atom becomes an ion?

What is the atomic mass of an element on the periodic table?

• The number of protons in the nucleus

• The average mass of all the isotopes of that element, weighted by their natural abundances

• The total number of subatomic particles in the atom

• The number of electrons in the atom

What is the molecular mass of water (H₂O)?

• 18 g/mol

• 1 g/mol

• 10 g/mol

• 32 g/mol