January 2018 NY Regents Chemistry Exam
35 Which trend is observed as the first four elements in Group 17 on the Periodic Table are considered in order of increasing atomic number? (1) Electronegativity increases. (2) First ionization energy decreases. (3) The number of valence electrons increases.
(4) The number of electron shells decreases.
Solution: Elements in the same group on the Periodic Table have the same number of valence electrons eliminating choice 3. The number of electron shells increases as we go down, eliminating choice 4. Electronegativity and Ionization energy increase going up the group. If we do not remember the trend, we can look at Table S on the Reference Table to find electronegativity values and ionization energy values for a couple of elements in Group 17 to establish the trend.
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