alexabbarker9781
07.10.2019 •
Chemistry
In what ara did reptiles become dominant
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Ответ:
Ответ:
The alkaline earth metals are barium and calcium.
Explanation:
Alkaline earth metals is the denomination given to the six elements that occupy Group 2 in the Periodic Table, therefore they have an electron configuration that ends in the orbital s².
From the list: barium and calcium are alkaline earth metals. On the other hand, lithium and sodium occupy Group 1, and aluminum occupies Group 3.