Respuesta :

132044

Answer:

Energy

Explanation:

When we provide energy to an atom then electrons present in non-valence shell get excited and reach to higher energy level. ... Hence, we can conclude that energy can be added to an atom to cause a non-valence electron in the atom to temporarily become a valence electron.

Answer:

Energy would be needed to cause an electron to be a valence electron.

Mass cannot be created nor destroyed as the law of conservation of mass states. Explanation:

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