Multiple choice

Carbon has 4 valence electrons and an element X has 7 valence electrons. What will be chemical formula of their saturated molecule formed by covalent bonding?

  1. C4X7

  2. CX4

  3. C2X4

  4. CX7

  5. C7X4

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon needs 4 electrons to complete its octet and X needs one electron to complete its octet. So, C can share an electron pair with four atoms of X to form a stable saturated molecule.