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Chemistry

Chemistry. Elements and Periodic Table of Elements. The Basics. Element = all the atoms are the same (JC) Element – cannot be broken down chemically into simpler substances (nuclear reactions are a different story!) How do we know what’s an element?. Periodic Table of …… Elements

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Chemistry

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  1. Chemistry Elements and Periodic Table of Elements

  2. The Basics • Element = all the atoms are the same (JC) • Element – cannot be broken down chemically into simpler substances • (nuclear reactions are a different story!) How do we know what’s an element?

  3. Periodic Table of …… Elements • Need to know • symbols of elements 1- 36

  4. C • is for Carbon • but • watch out for ……… • Potassium is K • Phosphorus is P • learn the rest as we go through the course

  5. Be careful • Symbol • can only have one capital letter • Na • not NA • not NA

  6. History • Greeks – 4 elements – were they right? • Boyle • (2000 ish years later!) • better idea of element • can’t be broken down into simpler substance

  7. Davy • used electricity to break down compounds into their elements (JC – you saw water broken into H and O) • he isolated Na, K, Ba, Sr, Ca, Mg

  8. Moseley • used x-rays • showed that the nucleus had positive charge • each element had different positive charge on its nucleus • Element ……. • all elements have the same atomic number (no. of protons

  9. Periodic Table Same number of electrons in outside shell • Vertical Lines are called Groups • Horizontal Lines are called Periods • Metals on left , non- metals in right • division begins at Boron • (check with Aluminium Al) Same number of shells

  10. Learning Check • Do I know…. (LC) definition of an element? 4 steps in how idea of element developed? Where is a group on PTE? What a group tells you? Where is a period on PTE? What this tells you? Correct way to write the symbols ?

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