Scientist Contribution Significance
Lavoisier (1743-1794)
Antonie-Laurent Lavoisier was born on August 26, 1743 in France’s capital city, Paris. One of his major discoveries was the founding of the law of conservation of mass. This law states the weights of reagents and products are conserved through any chemical reactions. This is demonstrated through his combustion experiments. He pointed out that combustion requires air, since the reactants are weighed heavier than its products. This disproved the ideas of phlogiston. During the 1700s, people regarded water and air as an element. But through Lavoisier discovery, he stated that water and air are compounds. From this, he discovered gases which was decomposed from these mediums. He coined …show more content…
In 1913, he demonstrated that major properties of an element are determined by the atomic number, not by the atomic weight. Mosely used a device known as an electron gun to fire streams of electrons at different elements. He found out that different elements give off different frequency of X-rays. Mosely calculated these frequencies and discovered that the frequency relating to atomic number gives off reasonable results, while frequencies of the atomic mass is unpromising. Not only he concluded that elements should be classified by its atomic number. He stated that the atomic number must be the number of positive charges on the nucleus, Mosely helped to refine the order of elements in the periodic table and this revealed the flaws in the periodic table. It also helped scientist to utilize the technique of X-ray spectroscopy to analysis and identify new elements.
Glenn Theodore Seaborg
(1912-1999) In 1941, Seaborg had discovered the first transuranium element (neptunium). Following the next few years, he had identified nine more new elements including plutonium. In addition to his discovery. He was responsible for the identification of more than 100 isotopes of elements throughout the periodic table and demonstrated how heavy metals have a relationship with other elements in the periodic table. Seaborg added new elements to the periodic table which was known as transuranium elements as they emit prominent level of
Lavoisier (1743-1794)
Antonie-Laurent Lavoisier was born on August 26, 1743 in France’s capital city, Paris. One of his major discoveries was the founding of the law of conservation of mass. This law states the weights of reagents and products are conserved through any chemical reactions. This is demonstrated through his combustion experiments. He pointed out that combustion requires air, since the reactants are weighed heavier than its products. This disproved the ideas of phlogiston. During the 1700s, people regarded water and air as an element. But through Lavoisier discovery, he stated that water and air are compounds. From this, he discovered gases which was decomposed from these mediums. He coined …show more content…
In 1913, he demonstrated that major properties of an element are determined by the atomic number, not by the atomic weight. Mosely used a device known as an electron gun to fire streams of electrons at different elements. He found out that different elements give off different frequency of X-rays. Mosely calculated these frequencies and discovered that the frequency relating to atomic number gives off reasonable results, while frequencies of the atomic mass is unpromising. Not only he concluded that elements should be classified by its atomic number. He stated that the atomic number must be the number of positive charges on the nucleus, Mosely helped to refine the order of elements in the periodic table and this revealed the flaws in the periodic table. It also helped scientist to utilize the technique of X-ray spectroscopy to analysis and identify new elements.
Glenn Theodore Seaborg
(1912-1999) In 1941, Seaborg had discovered the first transuranium element (neptunium). Following the next few years, he had identified nine more new elements including plutonium. In addition to his discovery. He was responsible for the identification of more than 100 isotopes of elements throughout the periodic table and demonstrated how heavy metals have a relationship with other elements in the periodic table. Seaborg added new elements to the periodic table which was known as transuranium elements as they emit prominent level of