I don't understand your problem with this. The process of elimination should give you the answer.
a. Look on the periodic table and find the atomic mass. Are they the same?
b. Does the reactivity change as you down or up the table?
c. Do elements in the same column have the same number of valence electrons?
d. Don't elements change their size as one goes up or down the table?
Examine the elements listed below.
nitrogen (N), phosphorus (P), arsenic (As)
Which of the answer choices accurately describes a common property of these elements?
they have the same amount of atomic mass
they have the same amount of reactivity
they have the same number of valance electrons
they have the same atomic radius size
please help
2 answers
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