An unknown metal displaces aluminum (Al) from solution but does not displace sodium (Na). Using the activity series, determine the unknown metal. A.
calcium (Ca)

B.
zinc (Zn)

C.
manganese (Mn)

D.
magnesium (Mg)

Magnesium or calcium as they are both more reactive than aluminium and less reactive than sodium

magnesium (Mg) Please dont be like the dummy above and say two answer's THATS NOT AN ANSWER THATS A GUESS but here you go :)

Also not being rude but report incorrect answer's I'm assuming like myself you guy's are paying so you don't have to stress over school so please if you see a multi answer that makes no sense like the guy above please report it. have a wonderful day and sorry about the long message.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.