Which of the following statements are true regarding an ionic bond between cobalt and sulfur in a

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Which of the following statements are true regarding an ionic bond between cobalt and sulfur in a CoS formula unit?

(a) Cobalt ions and sulfide ions bond by electrostatic attraction.

(b) Cobalt atoms gain electrons and sulfur atoms lose electrons.

(c) The ionic radius of a cobalt ion is greater than its atomic radius.

(d) Breaking an ionic bond between cobalt and sulfur requires energy

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