Grade 9 Unit B Section 2 Review Quiz

Which greek philosopher said the elements are various combinations of air, earth, fire and water?

• Democritus

• Aristotle

• Berzelius

• Pythagoras

Who developed the "electron shell" model of the atom?

• Rutherford

• Dalton

• Bohr

• Thomson

The ____________ is a positively charged sub atomic particle

The __________ is a negatively charged particle that orbits the atom.

The ___________ is 1/10 000th the size of the atom and composed of protons and neutrons

An element's ________________ tells us how many protons that element has.

An element's ______________ tells us the average mass of an atom of that element.

A substance that is conductive, shiny, malleable, ductile, and a solid at room temperature is likely classified as a...

• metal

• metalloid

• nonmetal

• none of the above

A reactive nonmetal likely belongs to which group on the periodic table?

• Alkali Metals

• Alkaline Earth Metals

• Halogens

• Noble Gases

True or False. Elements on the periodic table become more reactive as we move from left to right on the periodic table.

• True

• False