which are some of the works of the first scientist?
He developed ways of purification and creation of various acids, metals and other chemical compounds
Introduction
Michael Sendivogius (; ; 2 February 1566 – 1636) was a Polish alchemist, philosopher, and medical doctor. A pioneer of chemistry, he developed ways of purification and creation of various acids, metals and other chemical compounds. He discovered that air is not a single substance and contains a life-giving substance—later called oxygen—170 years before Scheele's discovery of the element. He correctly identified this 'food of life' with the gas (also oxygen) given off by heating nitre (saltpetre). This substance, the 'central nitre', had a central position in Sendivogius' schema of the universe.
oxygen (o2) is formed in photosynthesis as a direct result of Light-driven splitting of water during oxygenic photosynthesis how does lavoisier contribute? He conducted the first adequate quantitative experiments on oxidation and gave the first correct explanation of how combustion works what are its isotopes? They are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number what are its allotropes? UNANSWERABLE how is it stored? UNANSWERABLE is it toxic? No it is not toxic what are its industrial uses? UNANSWERABLE which scientist was involved in early experiments related to it? It was solated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele which theory was proposed by the second scientist? Theory of phlogiston
He  developed ways of purification and creation of various acids, metals and other chemical compounds He  developed ways of purification and creation of various acids, metals and other chemical compounds. UNANSWERABLE
Michael Sendivogius Michael Sendivogius
Introduction Introduction
A pioneer of chemistry, he developed ways of purification and creation of various acids, metals and other chemical compounds.  A pioneer of chemistry, he developed ways of purification and creation of various acids, metals and other chemical compounds. 
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Michael Sendivogius [SEP] Introduction
Michael Sendivogius (; ; 2 February 1566 – 1636) was a Polish alchemist, philosopher, and medical doctor. A pioneer of chemistry, he developed ways of purification and creation of various acids, metals and other chemical compounds. He discovered that air is not a single substance and contains a life-giving substance—later called oxygen—170 years before Scheele's discovery of the element. He correctly identified this 'food of life' with the gas (also oxygen) given off by heating nitre (saltpetre). This substance, the 'central nitre', had a central position in Sendivogius' schema of the universe.