Answer:
Iron, copper , calcium
Explanation:
Iron , copper and calcium are present in three different groups.
Iron is present in group eight.
Copper is present in group eleven.
Calcium is present in group two.
Sodium , potassium and rubidium are present in same group i.e. group one. These are alkali metals.
Fluorine, chlorine and bromine are present in group seventeen. These are halogens.
Argon, Krypton and xenon are present in same group i.e, group eighteen. All are these noble gases.
60+68=128
128/2=64
so the answer is 64
I hope this helped
The answer would be .40008L
The word milli- translates to

units. In this case, we have liters as our base unit. So a milliliter is

Liters or you can say that there are:
1,000 mL in 1 L.
As I understand, you are trying to convert 400.08mL to L.
So this is how you are going to get it:

x

=