5 inches I am not sure but I THINK it’s 5 inches sry if I’m wrong
Non-valence electrons: 1s22s22p6. Therefore, we write the electron configuration for Na: 1s22s22p63s1. What is the highest principal quantum number that you see in sodium's electron configuration? It's n = 3, so all electrons with n = 3 are valence electrons, and all electrons with n < 3 are non-valence electrons.
Answer:
c
Explanation:
it is corundum now please follow me
Fewer option for consumers
the answer is 15.
4+4+4+1 =13 then u add the 2 outside the bracket which will give u 15
