[دنـــا]

Air contains 78% N2, 21% O2, and 1% Ar, by volume. What is the density of air at 1,000. torr and -10C?

A. 1.0 g/L
B. 6.1 g/L
C. 1.3 g/L
D. 1.8 g/L
E. 0.56 g/L

Which of these ground-state ions has unpaired electrons?
A. P3-
B. V5+
C. S2-
D. Sc2+


If the radius of atom X is greater than the radius of atom Y, then it is also likely that
A. X has a larger electron affinity than Y does.
B. X has a larger effective nuclear charge than Y does.
C. X has greater llic character than Y does.
D. X has a larger first ionization energy than Y doe


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