Atomic Structure

What is the smallest unit of an element that retains the properties of that element?

• molecule

• cell

• atom

• nucleus

Who proposed the plum pudding model of the atom?

• J.J. Thomson

• Ernest Rutherford

• Marie Curie

• Niels Bohr

What did Ernest Rutherford's gold foil experiment conclude about the structure of the atom?

• Atoms have a nucleus at the center with electrons orbiting around it.

• Atoms are indivisible

• Electrons are located in the nucleus

• Protons and neutrons are located outside the nucleus

What is the nucleus of an atom composed of?

• Protons and neutrons

• Protons and electrons

• Neutrons and electrons

• Electrons and protons

Who proposed the planetary model of the atom?

• Isaac Newton

• Niels Bohr

• Albert Einstein

• Marie Curie

What are the subatomic particles found in the nucleus of an atom?

• Protons and neutrons

• Quarks and leptons

• Neutrons and electrons

• Electrons and protons

What is the overall charge of an atom?

• Positive

• Half-charged

• Negative

• Neutral

What is the Bohr model of the atom based on?

• Protons and neutrons in the nucleus

• Electron cloud model

• Electron orbits in specific energy levels or shells

• Quantum mechanics

What is the modern model of the atom called?

• Bohr Model

• Rutherford Model

• Quantum Mechanical Model

• Dalton Model

What is the most abundant element in the universe?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon