Which element has atoms with valence electrons in a higher energy level than those of calcium (Ca)? (1 point)

oxygen (O)

lithium (Li)

bromine (Br)

cesium (Cs)

Lithium element contains one electron therefore valence electron will be one.  

The highest level of energy is due to valence electrons which are available to the atom.

The calcium has 2 valence electrons which has electrons with high energy.

These energy will be used by the electron during the chemical reaction, and they will either lose or gain valence electron.

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calcium

Explanation:

2 electron

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge