Identify the following atoms using their symbols: a. contains 20 protons. ca
b. contains 12 electrons. mg
c. has atomic number = 30. Zn
d. the fifth-period transition metal with properties similar to copper. Ag
group VA metalloid in the fifth period.
f. the lightest metallic element in
g. the fourth-period element with properties similar to oxygen.
h. the metalloid in the second period.
i. the element with the fewest number of electrons in the sixth period.
j. the third-period element with the largest number of electrons.
e. the
group IVA.

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid

Achemical reaction is done in the setup shown , resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?

Why do the strengths of london (dispersion) forces generally increase with increasing molecular size? choose one: a. heavier atoms have stronger attractions for each other than lighter atoms. b. dispersion forces are all equal in magnitude; there is no size dependence. c. dispersion forces arise from the attraction between the nuclei of atoms, and larger molecules have larger nuclei. d. dispersion forces arise from dipoles caused by the electron distribution being distorted. larger molecules have more electrons and, therefore, more distortions and a bigger force. e. dispersion forces depend on distance. larger molecules are farther apart and so the forces are smaller.