Which of the following statements about elements in their compounds is false?
A) Some second row elements may have 7 or fewer valence electrons.
B) Most second row elements have 8 valence electrons.
C) Third row elements almost never have fewer than 8 valence electrons.
D) Third row elements may have more than 8 valence electrons.
E) Some second row elements may have more than 8 valence electrons.
answer is A some second row elements may have 7 or fewer valance electron
Explanation:
because as we know second row elements are from Li up to Ne; their atomic number is from 3 - 10 and when we work their electron configuration only the inert gas neon have 8 valance electrons ; the others have 7,6,5,4,3,2,1 from F up to Li respectively so the statement is true
other alternatives like b it is not true because there is one element only having 8 valance electrons so it is not true
D and C are not true because outer most shell cannot occupey more than 8 electrons because of that those elements cannot have more than 8 valance electrons
