Question

arrange the given elements in the decreasing order of their valencies: potassium, calcium, argon, silicon, phosphorus.​

Answer 1

Answer:

(lowest to highest).

Silicon

Phosphorous

Argon

Potassium

Calcium

Explanation:

Answer 2

Answer:

order of valencies from higher to lower:

Silicon > Phosphorus > Calcium > Potassium > Argon.

Explanation:

• Valency is the combining power of an element.
• We can say the valency of an element based on the group it belongs to.
• Silicon belongs to group 14. It belongs to carbon family.
• Valency of silicon = 18- group number = 18-14 = 4
• So valency of silicon is +4
• Phosphorus belongs to group 15 . It belongs to the nitrogen family.
• Valency of Phosphorus = 18 - group number

= 18 - 15 = 3

• So valency of Phosphorus is +3
• Calcium belongs to the family 2 . It belongs to alkali earth metals.
• So valency of calcium is 2.
• Potassium belongs to the family 1 . It belongs to alkali metals.
• So valency of potassium is 1.
• Argon is an inert element. It belongs to the group Noble gases. So valency of Argon is 0.
• So based on these the order of given elements based on valency is

Silicon > Phosphorus > Calcium > Potassium >Argon.

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