Naturally occurring antimony consists of 57.25
%

121
Sb
57.25
%

121
Sb
, which has a mass of
120.9

u
120.9

u
and
42.75
%

123
Sb
42.75
%

123
Sb
, which has a mass of
122.9

u
122.9

u
. Calculate the average atomic mass of antimony with the correct number of significant figures.

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Calcium chloride +gold(1) oxide—>

Given that 1 mi = 1760 yd, determine what conver- sion factor is appropriate to convert 1849 yd to miles; to convert 2.781 mi to yards.