element in which of the following groups can exist as a gas at room temperature?
A) Metals
B) Nonmetals
C) Metalloids
D) All of the above
elements has the largest electron affinity?
A) Oxygen
B) Sulfur
C) Selenium
D) Tellurium
isotopes of oxygen has nine neutrons?
A) 16O
B) 17O
C) 18O
D) None of the above
elements has the smallest atomic radius?
A) Potassium
B) Calcium
C) Gallium
D) Bromine
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