Atomic Structure

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

• Quarks, Leptons, Bosons

• Alpha particles, Beta particles, Gamma rays

• Positrons, Photons, Neutrinos

• Protons, Neutrons, Electrons

What is the charge of a proton?

• Negative

• Zero

• Neutral

• Positive

Where is the majority of the mass of an atom located?

• neutron

• proton

• electron cloud

• nucleus

What is the charge of an electron?

• 2.4 x 10^-19 C

• -1.6 x 10^-19 C

• -1.2 x 10^-19 C

• 0 C

What is the atomic number of an element?

• Number of electrons

• Number of neutrons

• Number of isotopes

• Number of protons

What is the mass number of an element?

• Total number of protons

• Total number of isotopes

• Total number of electrons

• Total number of electrons and protons

• Total number of protons + total number of neutrons

Explain the difference between atomic number and mass number.

• Atomic number is the sum of protons and electrons in an atom, while mass number is the number of neutrons.

• Atomic number is the total number of protons and neutrons in an atom, while mass number is the number of electrons.

• Atomic number is specific to each element and determines its identity, while mass number can vary within isotopes of the same element.

• Atomic number is the number of electrons in an atom, while mass number is the total number of particles in the nucleus.

How many electrons can the first energy level of an atom hold?

• 4

• 6

• 8

• 2