Write the subshell electron configuration of x
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Answer:To do a shorthand configuration for any element, count backwards from that element until you reach a noble gas. Write that element in brackets. Then, continue forward with next subshell(s) - see the attached version of the periodic chart that shows the subshell order with respect to the elements.
Explanation:The electronic configuration of an element x is : K L M. 2 8 6.
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