Which of the following symbols does not represent an element?
A) O 2
B) Co
C) HF
D) Cs
E) Xe
Correct Answer:
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Q21: Which of the following is a nonmetal?
A)Lithium,
Q22: A row of the periodic table is
Q23: Lithium forms compounds which are used in
Q24: Bromine has two naturally occurring isotopes. 79Br
Q25: Which one of the following statements about
Q27: In the modern periodic table, the order
Q28: Bromine is the only nonmetal that is
Q29: Which of the following is a metal?
A)Nitrogen,
Q30: An isotope of which of the following
Q31: Which of the following is a metalloid?
A)Carbon,
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