8th grade final review

What is anything that has mass and takes up space?

• Energy

• Matter

• Light

• Heat

What is the SI unit to measure volume?

• liter

• miles

• gallon

• kilogram

What is the formula for density?

• mass / volume

• mass * volume

• volume / mass

• mass + volume

Who discovered that atoms had a nucleus?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Albert Einstein

Energy levels of atoms are occupied by what?

• Electrons

• Protons

• Neutrons

• Photons

Who discovered electrons?

• J.J. Thomson

• Albert Einstein

• Isaac Newton

• Niels Bohr

What is the mass number of an atom that contains 7 protons, 7 neutrons, and 7 electrons?

• 14

• 21

• 7

• 28

What type of radioactive decay decreases the atomic number by 2?

• Alpha decay

• Beta decay

• Gamma decay

• Positron emission

What is the name of an atom of an element with different amounts of neutrons?

• Isotope

• Ion

• Isomer

• Isobar

Carbon has an atomic number of 6. If carbon’s mass is 14, how many neutrons are there?

• 6 neutrons

• 7 neutrons

• 8 neutrons

• 9 neutrons