13. Jane studies the properties of four ionic compounds: NaCl, KBr, CaS, and MgO, as shown in the table. What can she conclude about the elemental compositions of ionic compounds?

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They contain metallic and nonmetallic elements.
They contain semimetallic and metallic elements.
They contain metallic and transition elements.
They contain semimetallic and nonmetallic elements.

This is a required question

Jane can conclude that ionic compounds contain metallic and nonmetallic elements.