“Old dead guys”.  400 BC- Democritus- first to come up with the idea that things are made of “atoms”

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Presentation transcript:

“Old dead guys”

 400 BC- Democritus- first to come up with the idea that things are made of “atoms”

 John Dalton  Proposed the atomic theory

 Dmitri Mendeleev  Arranged elements into 7 groups with similar properties… 1 st version of periodic table.

 Discovered electrons and isotopes

 Famous experiment determined the charge of an electron… which is??

 Established that the nucleus of an atom was very dense and positively charged while electrons were outside the nucleus

 Made a model of the atom where electrons were in different orbitals

 Discovery of the neutron

 First of all… Elements are substances that cannot be broken down into simpler parts  Elements are made of atoms...Carbon is made of carbon atoms etc.  How small is an atom???  We can break down an atom but it loses its properties when we do…

 Three types of particles  Electrons  Protons  Neutrons

 Very tiny  Mass is basically zero (m=0)  Negative charge (-1)  Located flying around the nucleus

 Very large compared to electrons (mass =1)  Positive charge (+1)  Located in the nucleus of an atom

 Large like protons (mass=1)  Neutral charge or no charge  Located in the nucleus

 If this were the size of hydrogen nucleus, the electron would be spinning about a quarter mile away….  In a neutral atom, protons always equal electrons  Hydrogen has… 1 proton… 1 electron  Helium has… 2 protons… 2 electrons

 Atomic number = number of protons in nucleus  Atomic Mass= how many protons AND neurtons  How many protons in H?  How many neutron in H  How many electrons?

 How many P? N? E?

 Hydrogen:  Helium:

 Boron  Neon (noble gas)

 Magnesium