Unit 2 Matter Review

Which subatomic particle has a negative charge?

• proton

• neutron

• electron

• all particles

Which model of the atom has electrons traveling in specific paths around the nucleus?

• Dalton's Model

• Thomson's model

• Rutherford's model

• Bohr's model

What information does the atomic mass of an element provide?

• the sum of electrons and protons in an atom

• the difference between the number of protons and electrons

• the number of protons and neutrons in an atom

• the number of isotopes

How do scientists determine the number of neutrons in an isotope of an atom?

• They find the number of protons

• They divide the atomic mass by two

• They add the number of electrons and protons

• They subtract the atomic number from the atomic mass

What is the atomic number of an atom?

• the number of protons and neutrons

• the number of neutrons

• the number of electrons and neutrons

• the number of protons

How many protons are in an element with an atomic number of 8 and a mass number of 18?

• 3

• 8

• 10

• 18

Two atoms that are isotopes of one another must have a different number of what?

• protons

• neutrons

• electrons

• all particles

What is the smallest particle representing hydrogen peroxide?

• a hydrogen atom

• a molecule

• an oxygen atom

• diatomic oxygen

Which property is a physical property?

• malleable

• easy to digest

• burning

• becomes moldy quickly

What state of matter can be compressed?

• solids

• liquids

• gases

• solids, liquids, and gases