Identify the element out of the choices for which hints are given: (a

1.	Identify the element out of the choices for which hints are given: (a) Hint (This metal is extracted from sea water), choices (Mg, Be, Ca, Sr) (b) Hint (Material used in solar cells contain the metal); choices (Cs, Si, K, Rb). (c) Hint (most electropositive element amongst alkaline earth metals); choices (Be, Ba, Ca, Mg).
Answer» (a) Mg because Mg and …. a are present in large amount in sea water. (b) Si is used in solar cells. (c) Ba is most electropositive because electrospositive character increases down the group.

Identify the element out of the choices for which hints are given: (a) Hint (This metal is extracted from sea water), choices (Mg, Be, Ca, Sr) (b) Hint (Material used in solar cells contain the metal); choices (Cs, Si, K, Rb). (c) Hint (most electropositive element amongst alkaline earth metals); choices (Be, Ba, Ca, Mg).

Answer»

(a) Mg because Mg and …. a are present in large amount in sea water.

(b) Si is used in solar cells.