Question

^{How many valence electrons does an atom of antimony, Z = 51, have?}

^{How many valence electrons does an atom of fluorine, Z = 9, have?}

^{How many valence electrons does an atom of sodium, Z = 11, have?}

^{How many valence electrons does an atom of aluminum, Z = 13, have?}

Answer 1

For getting valance electrons first we have to write the general electronic configuration of that element then we can calculate the most outer electrons from them. So the outermost part of configuration contains valance electrons

₅₁Antimony have electronic configuration :-[Kr] 4d10 5s2 5p3

So total number of valance electrons= 5 answer

₉fluorine have electronic configuration :-[He] 2s2 2p5

So total number of valance electrons = 7 answer

₁₁sodium have electronic configuration :- [Ne] 3s1

So the total number of valance electrons = 1 answer

₁₃aluminium have electronic configuration :- [Ne] 3s2 3p1

So the total number of valance electrons = 3 answer