Unit 1: Atoms Test Review

A rock has a mass of 425 g and a volume of 25 cm³. What is its density?

• 25 g/cm³

• 17 g/cm³

• 10 g/cm³

• 21 g/cm³

Which formula is used to calculate density?

• Density = Volume ÷ Mass

• Density = Mass × Volume

• Density = Mass ÷ Volume

• Density = Mass + Volume

Which subatomic particle identifies an element?

• Neutrons

• Protons

• Electrons

• Nucleus

What is the mass number of an atom with 15 protons and 16 neutrons?

• 15

• 16

• 31

• 1

An isotope of magnesium has 12 protons and 14 neutrons. What is its mass number?

• 12

• 14

• 26

• 24

Which subatomic particle has a negative charge?

• Proton

• Neutron

• Electron

• Nucleus

Which subatomic particle has almost no mass?

• Proton

• Neutron

• Electron

• All are the same

Which scientist proposed the 'plum pudding model'?

• Dalton

• Rutherford

• Thomson

• Bohr

What did Rutherford discover from the gold foil experiment?

• Atoms are indivisible

• Atoms have a dense nucleus

• Electrons travel in fixed orbits

• Atoms are solid spheres

Which scientist said electrons orbit the nucleus in energy levels?

• Dalton

• Bohr

• Thomson

• Rutherford