Chemistry 3rd 9 Weeks Benchmark Review

Which particle of an atom has a negative charge?

• Proton

• Neutron

• Electron

Modern atomic theory states that the atom is a diffuse cloud surrounding a small, dense nucleus. Identify which particle is in the nucleus.

• Ion

• Neutron

• Electron

• Free radical

Identify the person who proposed the atomic theory first.

• J J Thompson

• Neils Bohr

• John Dalton

• Robert Millikin

While the atomic number helps us to find elements on the periodic table, it also tells us _______________________.

• The atomic mass of an element

• The number of electrons in an element

• The chemical symbol of an element

• The number of protons in an element

• The number of neutrons in an element

An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these?

• An atom that contains 12 protons and 13 neutrons.

• An atom that contains 12 neutrons and 13 protons.

• An atom that contains 12 protons and 25 neutrons.

• An atom that contains 12 neutrons and 25 protons.

If an atom were to lose an electron, its charge would be _______________.

• 0 or neutral

• +1

• -1

What is the identity of the atom shown?

• Aluminum

• Boron

• Cobalt

• Silicon

Why does the mass of the two products in a nuclear fission reaction weigh less than the nucleus from which it came from?

• Due to the amount of energy that is released

• Due to the amount of energy that is consumed

• They weigh the same

• They do weigh more than the nucleus they came from

Which one does not require extremely high temperatures which allows for this to happen in nuclear power plants?

• Nuclear Fission

• Nuclear Fusion

Which is true about nonmetal elements?

• Nonmetals are known to add protons to their nuclei causing them to become negatively charged.

• Nonmetals lose one or more valence electrons to become stable, giving them a negative oxidation number.

• Nonmetals gain one or more valence electrons to become stable, giving them a negative oxidation number.

• Nonmetals are known to lose protons and add neutrons to their nuclei causing them to become negatively charged.