A. Stability is increased with greater mass.

B. Mobility is reduced in atoms with extra electrons.

C. The outer energy level becomes the same as a noble gas.

D. The most stable ratio of electrons to protons is achieved.

A. nitrogen, arsenic, and antimony

B. carbon, selenium, and iodine

C. silicon, sulfur, and germanium

D. silicon, sulfur, and chlorine

N, C, B

N, P, As

N, O, F

F, O, N

A. A piece of metal is cut in half.

B. An ice cube melts on a counter.

C. A camper roasts marshmallows over a burning fire.

D. A baker mixes together flour and sugar to make dough.

A. the melting of the wax

B. the burning wick of the candle

C. the sugar dissolving in the tea

D. the steam coming from the tea