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  • 15-12-2022
  • Chemistry
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4. A main group element has 81 protons and an estimated nuclear charge of +3. Therefor, the element has ____ electrons and can be on in Group ____ of the Periodic Table.
Which set correctly complete the blanks?
A. 84, 3A
B. 81, 5A
C. 78, 3A
D. 78, 5A

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