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The Periodic Table

The periodic table is a systematic classification of chemical elements. From only 13 known elements in 1735 to over 100 today, it continues to evolve. Dmitri Mendeleev's 1886 model predicted missing elements. Elements are arranged by atomic number, reflecting the number of protons. The table provides atomic weight, symbol, and insights into element properties. Periods are the horizontal rows, and groups are the vertical columns, with elements in the same group exhibiting similar characteristics, such as the inert gases Helium, Neon, and others.

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The Periodic Table

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  1. The Periodic Table

  2. The periodic table is a system which helps to classify the elements.

  3. In 1735 there were only 13 known elements.

  4. In 1815 there were 47.

  5. Today there are over 100 including several man-made elements.

  6. The periodic table that we use today was devised by a Russian scientist named Dmitri Mendeleev in 1886

  7. Using his model, he was able to predict the properties of missing elements before their actual discovery took place.

  8. The periodic table can tell us many things, elements are arranged in order of their atomic numbers.

  9. The atomic number is based on the number of protons in the atom. A proton is a very small part of an atom that has a positive charge.

  10. The atomic weight/mass of an element and symbol are also given.This is the average mass of the element based on atomic mass units (AMUs)

  11. The atomic weight/mass of an element and symbol are also given

  12. One AMU is equal to one twelfth (1/12) of the mass of carbon.

  13. This is Carbon and Iron.

  14. The horizontal rows in the periodic table are called periods.

  15. The vertical columns are called groups.

  16. All elements in the same group have similar characteristics. For example the last group – helium, neon, argon, krypton, xenon and radon are inactive gases

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