What compound name belongs in box (1) in figure 3? what type of bond belongs in box (3) in figure 3?

The compound name  which belongs to  box[1] is known as Sodium chloride.

It is the common salt.

Before going to answer the second question, first we have to understand ionic and covalent bond.

The ionic bond is formed between  electropositive metal and electronegative non metal. In this type of bond,the electropositive metal will lose electrons and forms cation where electronegative element will accpert electrons to form  anion.The cations and anions are attracted to each other to form a compound.

The covalent bond is a type of bond in which sharing of electrons will occur to satisfy octet role which will result in the stability of the compound.

Hence the correct answer to the second question will be covalent.

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