Question

In which of the following groups all the three members are of the alkaline earth metals family
$A)Al,Sr,Ti \\\ B)Li,Na,K \\\ C)Mg,Ba.Ca \\\ D)Rb,Cs,Fr$

Answer 1

Hint : The alkaline earth metals are six chemical elements in group two of the periodic table. The alkaline earth metals are the second most reactive metals in the periodic table, and, like the Group one metals, have increasing reactivity in the higher periods.

Complete Step By Step Answer:
Alkaline earth metals are beryllium, magnesium, calcium, strontium, barium, and radium. The elements have very similar properties. They are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure
Structurally, they have in common an outer $s -$ orbital which is full that is, this orbital contains its full complement of two electrons, which the alkaline earth metals readily lose to
form cations with charge $+ 2$ , and an oxidation state of $+ 2$ .
The alkaline earth metals are all silver-colored and soft, and have relatively low densities, melting points, and boiling points.
In chemical terms, all of the alkaline earth metals react with the halogens to form the alkaline earth metal halides, all of which are ionic crystalline compounds
So, the correct answer is $C)Mg,Ca,Ba$ .

Note :
Beryllium is utilized for the most part for military applications, yet there are different employments of beryllium, also. In hardware, beryllium is utilized as a $p -$ type dopant in some semiconductors, and beryllium oxide is utilized as a high-strength electrical separator and warmth conductor. Due to its light weight and different properties, beryllium is likewise utilized in mechanics when firmness, light weight, and dimensional steadiness are needed at wide temperature ranges.