Understanding Atoms and Elements

What is the smallest component of an element that retains its properties?

• Molecule

• Atom

• Compound

• Electron

Which subatomic particle has a positive charge?

• Photon

• Proton

• Electron

• Neutron

What determines the atomic number of an element?

• Number of electrons

• Number of protons

• Number of isotopes

• Number of neutrons

Why are neutrons important in nuclear chemistry?

• Their manipulation leads to nuclear energy

• They have a positive charge

• They are responsible for chemical reactions

• They determine the atomic number

What is an isotope?

• An atom with a different number of neutrons

• A compound with similar atoms

• A particle with a positive charge

• A molecule with different elements

What is a molecule?

• A subatomic particle

• A type of isotope

• A combination of atoms

• A single atom

Which of the following is a compound?

• Hydrogen

• Oxygen

• Gold

• Water (H2O)

How is the mass number of an atom calculated?

• Number of protons plus neutrons

• Number of neutrons plus electrons

• Number of protons plus electrons

• Number of isotopes plus protons

What information does the periodic table provide?

• Atomic number and mass number

• Number of isotopes

• Chemical reactions

• Molecular structure

Why is memorizing the periodic table discouraged?

• It's not useful

• It's available everywhere

• It's too complex

• It's outdated