Which description best explains a molecular bonding?

donates electrons
shares electrons
charged ions attract
occurs between metals

question 2(multiple choice worth 2 points)

(07.01 mc)

isotopes of the same element always have the same

atomic mass number
a-number
z-number
neutrinos

question 3(multiple choice worth 2 points)

(07.01 mc)

rutherford's famous gold foil experiments shot heavy particles at a thin sheet of gold foil. what did he observe, and why did these observations eventually result in the addition of a nucleus to the atomic model?

some particles bounced off the foil, because there are positive particles spread throughout the atom.
the heavy particles all passed straight through the foil, because the atoms are mostly empty space.
some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.
the heavy particles all bounced off the foil, because the subatomic particles have mass and volume.

question 4(multiple choice worth 2 points)

(07.01 mc)

which of the following is an example of a chemical change?

boiling water
burning paper
dissolving sugar in water
melting gold

question 5(multiple choice worth 2 points)

(07.01 mc)

what happens to the atomic number of an atom when the number of neutrons in the nucleus of that atom increases?

it decreases
it increases
it doubles
it remains the same

question 6(multiple choice worth 2 points)

(07.01 mc)

modern atomic theory states that atoms are neutral. how is this neutrality achieved?

equal number of neutrons and protons
equal number of protons and electrons
more electrons than protons
more neutrons than electrons

question 7(multiple choice worth 2 points)

(07.01 mc)

a neutral atom of sodium has 12 neutrons and 11 protons. how many electrons does this sodium have?

1
11
12
23

question 8 (matching worth 4 points)

(07.01 lc)

match the scientist to his contribution to the atomic theory.

match term definition
thomson a) electron cloud and orbitals
rutherford b) nucleus
bohr c) electron energy levels
schrodinger d) electrons