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# Four elements P, Q, R and S belong to groups 13, 15, 16, and 17, but not in that order. The electronegativity values of four elements in the same period of the periodic table are listed below:

$\begin{array} {llll} P & Q & R & S\\ 3.0 & 2.0 & 3.5 & 4.0 \\ \end {array}$

Based on this information, which element belongs to which group?

$\begin{array}{1 1} P = 13 Q = 15 R = 16 S = 17 \\ P = 15 Q = 13 R = 16 S = 17 \\ P = 15 Q = 13 R = 17 S = 16 \\ P = 13 Q = 16 R = 15 S = 17 \end{array}$

Answer: P = 13, Q = 15, R = 16, S = 17
Electronegativity increases along a period from left to right.
Arranged in the increasing order, the values of electronegativity are: $P (2.0) \lt Q (3.0) \lt R (3.5) \lt S (4.0)$