Number of elements from the following that CANNOT form compounds with valencies which match with....

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Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is
B,C,N,S,O,F,P,Al,Si πŸ“²PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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