Astatine has a(n) ________ density and a(n) ________ atomic radius compared to iodine.
A) greater; greater
B) smaller; greater
C) smaller; smaller
D) greater; smaller
E) equal; equal
Question 2
Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N2 (g) + 3H2 (g) 2NH3 (g) If the reaction yield is 87.5, how many moles of N2 are needed to produce 3.00 mol of NH3?
A) 0.166
B) 1.00
C) 1.5
D) 1.71
E) 2.32
Question 3
What is the formula of the compound formed between strontium ions and nitrogen ions?
A) SrN
B) Sr3N2
C) Sr2N3
D) SrN2
E) SrN3
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Cretinism can result in a child born to a mother who was iodine deficient during early pregnancy
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