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Write the formula of sulphide of an element C, whose atomic number is 5.(C is not the actual symbol of the element)

Question

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Solution

Step 1: Identify the element with atomic number 5.

The element with atomic number 5 is Boron.

Step 2: Determine the valency of the element.

Boron is in group 13 of the periodic table and has a valency of 3.

Step 3: Determine the valency of sulphide.

Sulphide has a valency of 2.

Step 4: Write the formula.

When writing the formula, the valency of one element becomes the subscript of the other. Therefore, the formula for the sulphide of Boron (element C) is B2S3.

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