The Periodic Table CHAPTER 10---LESSON # 1 Periodic: repeating, according to a pattern. Ex: days of...
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Transcript of The Periodic Table CHAPTER 10---LESSON # 1 Periodic: repeating, according to a pattern. Ex: days of...
The Periodic TableCHAPTER 10---LESSON # 1Periodic: repeating, according to a pattern. Ex: days of the week, months, years, etc.Dmitri Mendeleev- “Father of the Periodic Table. Late 1800’s. Arranged PT by the physical and chemical properties of the elements.
• Mendeleev arranged the elements in order of increasing atomic mass.
• The PT is a chart of the elements arranged into rows and columns according to their physical and chemical properties.
Early 1900’s – Henry Moseley
• Henry Moseley changed the PT to be arranged in order ofIncreasing Atomic # instead of increasing atomic mass.
• By doing this, the groups/families then had similar physical And chemical properties ( columns )
Bergmann video on size of atom
https://www.ted.com/talks/just_how_small_is_an_atom#
How is the PT arranged NOW?• By increasing atomic number.• By their state--solid, liquid or gas at room temperature.• By groups – due to their physical and chemical properties.• By 3 main groups: metals, metalloids and non-metals
Groups and Periods• Groups or Families: 18 of them. They go down ( Vertical ) on the table.
• Periods: 7 of them. They go across (horizontal ) on the table.
Like a calendar
3 main categories of the PT
1. Metals, Non-metals and Metalloids
• Most of the table, ¾ , are metals.
• Metals are on the left side of the “staircase,” except for H on the far left. ( NOT A METAL!)
• Nonmetals, plus H, are to the right of the “staircase.” Many of these are gases.
• Metalloids are ON the staircase.
The Periodic Law
It states that the chemical and physical properties of elements are periodic or repeating functions of their atomic numbers.