ACTIVITY 2: Make a timeline of the historical development of the Periodic Table using the suggested format below.
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ACTIVITY 2: Make a timeline of the historical development of the Periodic Table using the suggested format below.
ACTIVITY 2: Make a timeline of the historical development of the Periodic Table using the suggested format below.
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Answer:
In 1669 German merchant and amateur alchemist Hennig Brand attempted to created a Philosopher’s Stone; an object that supposedly could turn metals into pure gold. He heated residues from boiled urine, and a liquid dropped out and burst into flames. This was the first discovery of phosphorus.
In 1680 Robert Boyle also discovered phosphorus, and it became public.
In 1809 at least 47 elements were discovered, and scientists began to see patterns in the characteristics.
In 1863 English chemist John Newlands divided the then discovered 56 elements into 11 groups, based on characteristics.
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