Chemistry Quiz: Atoms, Nuclei, and Isotopes

Who mathematically proved the existence of atoms and molecules in 1905?

• Marie Curie

• Albert Einstein

• Isaac Newton

• Niels Bohr

What is the defining characteristic of any element?

• Atomic number

• Atomic mass

• Number of electrons

• Number of neutrons

What is the role of neutrons in the nucleus of an atom?

• They determine the chemical properties of the atom

• They stabilize the nucleus and give it additional mass

• They repel protons

• They determine the atomic number

Why are relative atomic masses never whole numbers?

• Because of the number of electrons

• Because of the number of protons

• Because of the different isotopes of the same element

• Because of the number of neutrons

Where does all the interesting chemical activity happen in an atom?

• In the neutrons

• In the protons

• In the nucleus

• In the electrons

What is the chemical symbol for silver?

• Si

• Au

• Sv

• Ag

What is the mass number of an isotope?

• The total number of protons and neutrons in the nucleus

• The number of neutrons in the nucleus

• The average atomic mass of all the atoms of that element

• The number of protons in the nucleus

What is the role of the strong nuclear force in the nucleus?

• It stabilizes the nucleus

• It repels protons

• It determines the atomic number

• It determines the chemical properties

What is the correct pronunciation of 'nucleus'?

• NU/cue/lus

• NU/clee/us

• NU/clear/us

• NYOO/coo/los

What determines the atomic number of an element?

• The average atomic mass of all the atoms of that element

• The number of electrons in the atom

• The number of protons in the nucleus

• The total number of nucleons in the nucleus