Who is the first to propose the existence of atoms?

• Dalton
• Democritus
• Thomson
• Aristotle

Who discovered the nucleus of an atom?

• Dalton
• Bohr
• Thomson
• Rutherford

Which particle(s) are found in the nucleus of an atom?

• Protons
• Neutrons
• Electrons

For the atom to be neutral, what two particles have to have the same number?

• Protons
• Neutrons
• Electrons

What are these two nitrogen atoms called?

• Isotopes
• Atomic Numbers
• Alpha Particles
• Beta Particles

What is the same between these two nitrogen atoms?

• Same number of neutrons
• Same number of protons and neutrons
• Same number of protons
• Same number of neutrons and electrons

Which of these likely occurs the most in nature?

• Nitrogen - 14
• Nitrogen - 15

Which element is the atom below?

• Carbon
• Fluorine
• Sodium
• Lithium

What is the mass number of at atom below?

• 3
• 6
• 7
• 10

What is the atomic number of at atom below?

• 3
• 6
• 7
• 10