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Chemistry - 11-30-23 all Questions & answers solved 100% accurately with Complete Solution Graded A+ latest version
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Chemistry - 11-30-23 all Questions & answers solved 100% accurately with Complete Solution Graded A+ latest version

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  • July 6, 2024
  • 2
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • chemistry 11 30 23 all questions answers solve

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Chemistry - 11/30/23
✅
Aristotle .- 330 B.C.
Four element theory
Earth,fire,water,air

✅
Antoine Lavoisier - 1770-1789
Wrote the first of elements containing 33 elements
Distinguished between metals and non metals

✅
Jon Jakob Berzellius- 1828
Developed a table of atomic weights
Introduced letters to symbolize elements

✅
Johann Döbereiner- 1829
Developed “triads” groups of 3 elements with similar properties
Li,Na,and K
Ca,Sr,and Ba
Cl,Br,and I

✅
John Newlands - -1864
The known elements (<60) were arranged in order of atomic weight
He proposed the Law of Octaves *

✅
Lothar Meyer- 1869
Complied a Periodic Table of 56 elements based on the periodicity of
properties.

✅
Dmitri Mendeleev- 1869 (Father of the periodic table)
Produced a table based on atomic weights but arranged “periodically” with
elements with similar properties under each other
Gaps were left for elements that were unknown at the time and the
properties predicted the elements were gallium,scandium,and germanium

William Ramsey- ✅1894

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