The element whose outermost shell is complete and they do not react with other elements is called
a)Metal elements
b)Reactive elements
c)Unstable elements
d)Rare earth elements
Answers
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They are rare earth elements , bcoz every element is somewhere unstable
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Answer:
Rare Earth Metals
Explanation:
thay are called alkaine earth metals
Structurally, they (together with helium) 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.
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