Science 8 Quiz #3 3rd Quarter

What is the basic unit of matter?

• Atom
• Molecule
• Cell
• Substance

Which subatomic particle has a positive charge?

• Neutron
• Proton
• Electron
• Nucleon

What do you call the center of an atom?

• Electron cloud
• Proton
• Nucleus
• Magnet

Which subatomic particle has negligible mass?

• Proton
• Neutron
• Electron
• Nucleon

What are protons and neutrons collectively called?

• Mass number
• Electrons
• Neutrons
• Nucleons

What is the atomic number of an element?

• Number of neutrons
• Number of protons
• Number of protons and electrons
• Number of electrons

How do you compute for the number of neutrons in an atom?

• Add protons and electrons
• Subtract atomic number from mass number
• Add protons and neutrons
• Divide mass number by atomic number

What is the charge of an electron?

• -1
• 1
• Neutral
• 2

What did Democritus call the smallest indivisible unit of matter?

• Electron
• Proton
• Atomos
• Nucleon

Which scientist adapted Democritus' theory into a modern atomic model?

• John Dalton
• Joseph John Thomson
• Ernest Rutherford
• Niels Bohr