What are atoms primarily composed of?

• Organisms

• Tiny particles

• Molecules

• Cells

What is the central part of an atom called?

• Electron

• Nucleus

• Proton

• Neutron

Which particles have a relative mass of one?

• Protons and electrons

• Protons and neutrons

• Electrons

• Neutrons and electrons

What charge do electrons carry?

• Neutral

• Positive

• No charge

• Negative

What happens when an atom gains an electron?

• It becomes a proton

• It becomes a negative ion

• It remains neutral

• It becomes a positive ion

What is the term for an atom that has lost or gained electrons?

• Compound

• Element

• Ion

• Molecule

What does the atomic number of an element indicate?

• Number of electrons

• Number of neutrons

• Number of atoms

• Number of protons

How do you calculate the number of neutrons in an atom?

• Atomic number minus mass number

• Mass number plus atomic number

• Mass number minus atomic number

• Atomic number plus mass number

What does the mass number of an element represent?

• Total number of protons and neutrons

• Total number of electrons

• Total number of neutrons

• Total number of protons

Which element is represented by the symbol 'O'?

• Osmium

• Oganesson

• Osmium

• Oxygen