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3. Which of the following has a noble gas electronic configuration?A Ra2+B Sc+C S-D P2-E more than one choice is correct

Question
3.   Which of the following has a noble gas electronic configuration?
A   Ra2+
B   Sc+
C   S-
D   P2-
E   more than one choice is correct

 

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Step 1

The tendency of an electron to either gain or loss electron to achieve the configuration of noble gas is known as noble gas configuration. The outermost shell of noble gas is completely occupied. 

Step 2

The atomic number of Ra is 88. Two electrons are removed from the outermost subshell forming Ra2+. Hence, the number of electrons becomes 86.

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Step 3

The atomic number of Sc is 21. One electron is removed from the outermost subshel...

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