We made a poster board of Mendeleev teaching it to us on a blackboard, and our information would slide out from it. Elements are arranged by atomic number, not atomic mass because each element has different isotopes that all have different masses but have the same atomic number. We also gave our quiz orally to the class.
Mendeleev's Periodic Table
- 1867, a Russian chemist and teacher, Dmitir Meneleev started organizing every known element and is credited with creating the first real periodic table of elements
- He discovered a pattern and left holes in the table for elements that had yet to be discovered
- There are 118 elements in the Periodic Table as of March, 2010
- There are 7 periods and 18 columns
- Metals are on the left and non-metals are on the right
- Elements with similar properties fall into vertical columns
- Atomic Number: Number of protons of the nucleus of each atom of an element
- Atomic Mass: Mass of an average atom of an element (tends to increase along with atomic number)
- Ion charge: Electric charge that forms on an atom when it gains or loses electrons
Mendeleev's Periodic Table
Modern Periodic Table
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