Question

The electron arrangement of sodium is 2.8.1. how many occupied main electron energy levels are there in an atom of sodium?

Answer 1

atom are located at specified distances from the nucleus and are found to have different 
amounts of energy. Only seven (7) main --principal energy levels, or electron shells are necessary to 
account for the electrons of the known elements. The main or principal energy levels (n) are numbered, 
starting with n = 1 as the energy level nearest to the nucleus and going to n = 7 . 


Na = 1s2 2s2 2p63s1 

#of OCCUPIED main electron energy levels = 2 (1s2 2s2 2p6) 

hope this helps;-D

Answer 2

Answer:

2. The electron arrangement of sodium is 2.8.1.  How many occupied main electron energy levels are there in an atom of sodium

Explanation: