ezez8347 ezez8347

14-12-2022
Chemistry

Answered

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

Answer :

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