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Which of the following element is NOT an alkaline earth metal?
Magnesium
Strontium
Barium
Beryllium
Alkaline earth metals are group II elements like calcium, magnesium, Barium, and strontium. Additional Information
The elements of Group 2 include beryllium, magnesium, calcium, strontium, barium, and radium.
These elements with the exception of beryllium are commonly known as alkaline earth metals.
These elements are called Alkaline Earth metals because of two reasons:
Their oxides exist in the earth's crust and are very stable to heat.
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.
Note: 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 4th is correct.
By: Gagandeep Singh ProfileResourcesReport error
Akshay Kishor
all are alkaline earth metal
No, it's an exception in case of Beryllium because Beryllium fulfills the first criterion but not the second one since its oxides and hydroxides show amphoteric behavior, rather than alkaline. Note: 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.
Himanshu Sharma
all are correct
Kindly revisit explanation
Beryllium is not consider alkaline earth metal in true sense because Beryllium fulfills the first criterion but not the second one, since its oxides and hydroxides show amphoteric behavior, rather than alkaline.
Vatsal Upadhyay
No correct option. Every metal mentioned above is alkaline earth metal.
Option 4th is correct because 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.
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