Chemistry

increases as nuclear charge increases

decreases as nuclear charge increases

decreases as nuclear charge decreases

remains constant as nuclear charge increases

1:1

1:2

2:1

2:3

pure samples of the same compound contain the same elements combined in the same proportion by mass

pure samples of substances are in the same proportion by mass

chemical compounds are pure because they contain the same elements

matter can neither be created nor destroyed.

42

45

126

180

do not conduct electricity

contain equal number of protons and electrons

are composed of neutrons and electrons

cannot be attracted by electromagnetic field.