Give the electron dot and molecular structure of magnesium chloride.

Elements  $\mathrm{A}, \mathrm{B}, \mathrm{and} \mathrm{C}$ have $9, 20, \mathrm{and} 10$ respectively.

State which one is: a non-metal?

Elements A, B, and C have 9, 20, and 10 respectively.

State which element is a metal?

Elements A, B, and C have 9, 20, and 10 respectively.

State which element is a chemically inert?

Elements A, B, and C have 9, 20, and 10 respectively.

Write down the formula of the compound formed by two of the above elements?

Match the atomic number $4, 14, 8, 15 \mathrm{and} 19$ with the following:

A solid non-metal of valency 3.

A gas of valency 2.

Match the atomic number 4, 14, 8, 15 and 19 with the following:

A metal of valency 1.

Match the atomic number $4, 14, 8, 15, \mathrm{and} 10$ with the following:

A non-metal of valency $4$.