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Also to know is, how many valence electrons are in the 4th Shell?
Beryllim has 4 electrons --- 2 in thefirstshell, and 2 in the second shell (so twovalenceelectrons). Boron has 5 electrons --- 2 in thefirstshell, and 3 in the second shell (so threevalenceelectrons). Carbon has 6 electrons --- 2 inthe firstshell, and 4 in the second shell (sofourvalence electrons).
Subsequently, one may also ask, how many electrons can the valence shell hold?
18
This is because it is the maximum capacity of the3rdshell and it doesn't tell about the order in whichtheelectrons are filled. The2,8,18,…configuration is taught till class10th in schools. The answer toyour question lies in knowing thereal configuration ofelements.