Understanding Atomic Structure and Particles

What is the charge of an electron?

• Positive

• Negative

• Neutral

• Variable

Which subatomic particle is found in the nucleus and has no charge?

• Electron

• Proton

• Neutron

• Photon

What does the atomic number of an element represent?

• The number of electrons

• The number of neutrons

• The number of protons

• The number of orbitals

What is the mass number of an atom?

• The total number of electrons

• The total number of protons and neutrons

• The total number of protons and electrons

• The total number of neutrons

What is a mole in chemistry?

• A unit representing 6.022 × 10^23 entities

• A unit representing 1.602 × 10^-19 entities

• A unit representing 9.109 × 10^-31 entities

• A unit representing 3.00 × 10^8 entities

What is an isotope?

• An element with the same mass number but different atomic numbers

• An element with the same atomic number but different mass numbers

• An element with the same number of electrons but different protons

• An element with the same number of neutrons but different electrons

Where are electrons most likely to be found in an atom?

• In the nucleus

• In orbitals around the nucleus

• In the proton cloud

• In the neutron field

What is a valence electron?

• An electron in the innermost shell

• An electron in the outermost shell

• An electron in the nucleus

• An electron in a photon

What is the charge of a proton?

• Negative

• Positive

• Neutral

• Variable

What is the unified atomic mass unit (u or amu) approximately equal to?

• The mass of an electron

• The mass of a proton or neutron

• The mass of a photon

• The mass of a mole