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Of the following elements, which is most likely to form a negative ion with charge 1–?...

Of the following elements, which is most likely to form a negative ion with charge 1–? Si ,Cl, Ba ,Ca or P

Which has these types of electromagnetic radiation arranged in order of decreasing energy?

-Radiowaves, Visible, Ultraviolet

-Visible, Ultraviolet, X-ray

-X-ray, Visible, Ultraviolet

-Ultraviolet, Visible, Infrared

-None of these choices are correct.

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Answer #1

Chlorine forms a negative ion with charge -1. Chlorine gains electrons to fill the valence energy level. Silicon has +4 or -4

Calcium and Barium has +2 charge (Same group in periodic tabel)

Phosphorus has a charge of -3

Order of decreasing energy of electro magnetic radiation

:Ultraviolet, visible and infrared

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