Question

history of periodic table???​

Answer 1

Here Is Your Ans ⤵

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The Periodic Table of Elements is a chart created by Dmitri Mendeleev in 1869 to help organize the elements that had been discovered at that time.

First we have to understand what an element is. All matter is made up of elements, which are substances with only one type of atom. They have the same number of neutrons, protons, and electrons. If you alter the number of the neutrons, protons, or electrons for any element an isotope is created. There are 92 elements that occur naturally and are found in nature. Hydrogen, carbon, nitrogen, and oxygen are found in most living organisms.

It is a substance that has only one type of atom. They have the same number of neutrons, protons and electrons. When you change the number of the neutrons, protons or electrons for any element you have created an isotope of that element.

Elements have been known to man since the ancient times. Sulfur is referred to in the Bible as brimstone and there are other references to other elements dating back to early times. To understand more about how the periodic table came into existence, there are some important dates to look at :-

# 1669 - Hennig Brand invented the Philosopher's Stone, which could turn metals into pure gold. He also discovered phosphorus.

# 1680 - Robert Boyle also discovered phosphorus without knowing about Hennig Brand's discovery.

# By 1809 about 47 elements had been discovered and named. Scientists began to see patterns in their atom structures.

# 1863 - John Newlands organized the 56 then known elements into eleven separate groups based upon their atom structure.

1869 - Dimitri Mendellev used John Newlands' grouping and organized the elements into what is now known as the periodic table. He used the atomic mass as the primary characteristic to decide where each element belonged in his table. The elements were arranged in rows and columns. He even left spaces for elements to be discovered because of the pattern he saw once he started organizing those elements known at that that time

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Answer 2

Answer:

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