Alkaline earth metals are

Li, Be, K, Mg, Ca

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Be, Mg, Ca, Sr, Ba

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Be, K, Mg, Ca, Sr

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Be, Mg, ca, K, Rb

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Solution

The correct option is B Be, Mg, Ca, Sr, Ba
Alkaline earth metals comprises of Be, Mg, Ca, Sr, Ba. Hence, the correct answer is option (b).

Theory:
Alkaline earth metal:
These elements are called alkaline earth metals(except beryllium) because their oxides and hydroxides are alkaline in nature and these metal oxides are found in the earth’s crust.
Electronic configuration - $[noble gas] n s^{2}$

Group 2 elements
$A t o m i c n o . e l e m e n t$
$4 B e r y l l i u m (B e)$
$12 M a g n e s i u m (M g)$
$20 C a l c i u m (C a)$
$38 S t r o n t i u m (S r)$
$56 B a r i u m (B a)$
$88 R a d i u m (R a)$

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