Question

a. Define Valency. b. Write the symbol and valency of the following : (i) Oxygen (ii) potassium 7. a. Magnesium burns in Oxygen to form Magnesium Oxide. a) Name the reactants b) Name the Products c) Write the word equation for the above reaction.

Answer 1

Oxygen-Symbol-O Potassium Symbol-K

Answer 2

⚘ Your Answers:

A) Valency is the combining capacity of any element. Valence electrons refers to the electrons found in the outermost shell of the atom of the element.

B) Symbol and valency:

1. Oxygen(O) = (At. no. 8) = -2(Valency)
2. Potassium(K) = (At. no. = 19) = +1(Valency)

C) The reaction would be:

`\large{ \boxed{ \rm{2Mg + O_2 \longrightarrow \: 2MgO}}}`

• Reactants = Magnesium and Oxygen
• Products = Magnesium oxide
• Word equation:

`\large{ \boxed{ \rm{Magnesium + Oxygen \longrightarrow Magnesium oxide.</p><p>}}}`

━━━━━━━━━━━━━━━━━━━━