Consider the following figure which represents an element block on the periodic table. If this is the block for the nonmetal found in period 3 group 5A,the question marks 1,2,and 3 should be filled in,respectively,with which of the following?
A)33, As, 74.92
B)23, V, 50.94
C)15, P, 30.97
D)39, Y, 88.91

Question

Consider the following figure which represents an element block on the periodic table.  If this is the block for the nonmetal found in period 3 group 5A,the question marks 1,2,and 3 should be filled in,respectively,with which of the following?
A)33, As, 74.92 
B)23, V, 50.94 
C)15, P, 30.97 
D)39, Y, 88.91

Quizplus · Accepted Answer

The nonmetal in period 3 and group 5A is nitrogen. The question marks indicate the atomic number, symbol, and atomic mass of the element in that block. The atomic number of nitrogen is 7, so it cannot be any of the answer choices. However, the element directly below nitrogen on the periodic table is phosphorus (atomic number 15). Therefore, the correct atomic number and symbol for the element in the block would be 15 and P, respectively. The correct atomic mass for phosphorus is 30.97, which matches option C. Options A, B, and D are all incorrect as they do not correspond to the element in question.

Consider the Following Figure Which Represents an Element Block on the Periodic