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Question
Which element of group --2 is not considered as an alkaline earth metal?
Which element of group --2 is not considered as an alkaline earth metal?
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Solution
The correct option is C Beryllium
The elements of Group 2 include beryllium, magnesium, calcium, strontium, barium and radium. These elements with the exception of beryllium are commonly known as the alkaline earth metalsThese elements are called Alkaline Earth metals because of two reasons:
- Their oxides exist in earths’s crust and are very stable to heat. ( That’s why the word “Earth” is used)
- Their oxides and hydroxides show basic (alkaline) natures.
Beryllium fulfills the first criterion but not the second one, since its oxides and hydroxides show amphoteric behavior, rather than alkaline.
So, it is not considered an alkaline earth metal in the true sense, even though it does resemble them in various other properties.
Hence option D is correct answer.
The elements of Group 2 include beryllium, magnesium, calcium, strontium, barium and radium. These elements with the exception of beryllium are commonly known as the alkaline earth metals
These elements are called Alkaline Earth metals because of two reasons:
- Their oxides exist in earths’s crust and are very stable to heat. ( That’s why the word “Earth” is used)
- Their oxides and hydroxides show basic (alkaline) natures.
Beryllium fulfills the first criterion but not the second one, since its oxides and hydroxides show amphoteric behavior, rather than alkaline.
So, it is not considered an alkaline earth metal in the true sense, even though it does resemble them in various other properties.
Hence option D is correct answer.
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