s210844 s210844
  • 20-12-2022
  • Chemistry
contestada

9. A Main Group element has 81 protons and an estimated effective nuclear charge of +3. Therefore,
the element has _______ core electrons and can be found in
bust
of the Periodic Table.
Which set correctly completes the blanks?
A. 84, Group 3
B. 81, Group 15
C. 78, Group 3
D. 78, Group 15
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