Question

During Robert Boyle period(time)____ elements were known
1) about 18
2) about 15
3) about 13
4) about 10

Answer 1

Every general-chemistry student learns of Robert Boyle (1627–1691) as the person who discovered that the volume of a gas decreases with increasing pressure and vice versa—the famous Boyle’s law. A leading scientist and intellectual of his day, he was a great proponent of the experimental method.


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Answer 2

During Robert Boyle's period(time) 18 elements were known.

• Brandt, in 1649, observed a glowing white substance in human urine and termed it as Phosphorous but the discovery was a secret until 1680 when Robert Boyle rediscovered Phosphorous and it got published.
• He defined an element as "a substance that cannot be broken down into a simpler substance by a chemical reaction."
• Around 13 elements were known till the Middle Ages, then till 1799, 21 elements were known to exist.