How many valence electrons does Calcium have?

2 valence electrons

Explanation:

it's a group 2 element. has 2 valence electrons in the outer energy level.

The answer is: 2 valence electrons

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Explanation:

you need to give more information

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."