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