Question

Which substance contains metallic bonds (1)Hg (2)H2O (3) NaCL (4)C6H12O6

Answer 1

Answer: (1)
`Hg`

Step-by-step explanation:

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals. Example:
`H_2O` and
`C_6H_(12)O_6`

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal. Example:
`NaCl`

Metallic bond is defined as the bond which is formed between positively charged atoms having free electrons and are shared among a lattice of cations. This is usually formed between metals. Example:
`Hg`

Answer 2

The answer is (1) Hg

Step-by-step explanation:

Hg is mercury. It is a metal, so the elemental substance have Hg atoms that interact each other by metallic bonds.

The other options do not contain metallic bonds:

(2) H₂O is water, and contains covalent bonds

(3) NaCl is sodium chloride and is a ionic compound (ionic bonds)

(4) C₆H₁₂O₆ is glucose, and the atoms are covalently bonded.