Which of the following element combinations will form ionic compounds? 1. $\mathrm{Ca}(\mathrm{Z}=20)$ and $\mathrm{Ti}(\mathrm{Z}=22)$ 2. $\mathrm{Si}(\mathrm{Z}=14)$ and $\mathrm{Br}(\mathrm{Z}=35)$ 3. $\mathrm{Mg}(\mathrm{Z}=12)$ and $\mathrm{Cl}(\mathrm{Z}=17)$ Select the correct answer using the code given below.

• A

  2 only
• Correct answer
  B

  3 only
• C

  2 and 3 only
• D

  1,2 and 3

Hence, the correct answer is option: 'B'.