Question

How is beryllium (Be) similar to calcium (Ca)?​

Answer 1

Both Beryllium and Calcium have 2 valence electrons, i.e. in ther electronic configuration there are 2 electrons remaining in the outermost shell. Thus their valencies are also 2.

Electronic Configurations:

Beryllium (4) : - [2, 2]

Calcium (20) : [2, 8, 8, 2]

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Edit

a. both are very reactive

b. both react readily with elements in group 1

c. both rarely combine with other elements

d. both are rare metals

(As per the suggestion of bvbfanforeverap5j54d)

Answer 2

Step-by-step explanation:

beryllium, calcium, strontium, barium, and radium; they are in the same group of table.