https://padlet.com/waggle_p/iggvhs2zw0jw Paige waggle 3* en-us 2018-10-14 13:44:27 UTC 2025-11-03 10:21:17 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Soccerball.png waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292532057 - He believed that atoms were indestructible and indivisible.
- He lacked experimental support because his approach was not based on the scientific theory.
 

]]> 2018-10-14 13:46:24 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292532057 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292533153 - John Dalton used Democritus's idea and used the scientific method and came out with a whole new theory. 
- 1. All elements are composed of atoms 
-2. atoms of the same element are identical. The atoms of any one element are different from any other element 
- 3. Atoms of different elements can be physically mixed together or can chemically combine in simple whole- number ratios to from a compound 
- 4. Chemical Reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element. 
 

]]> 2018-10-14 13:56:01 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292533153 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292535388 - Electrons - negatively charged subatomic partials.
- He performed experiments that involve passing electric currents through gasses at low pressure. He sealed the gasses in tubes and at the bottom there were metal disks called electrodes.

- Thompson knew that opposites attract tiny negatively changed participial moving at high speed. He called these particles Corpuscles aka Electrons.
- Thompson concluded that electrons must be parts of the atoms of all elements.

- Electrons were stuck to the lamp of a positive charge similar to the raisins stuck in the dough.]]> 2018-10-14 14:14:07 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292535388 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292540489 2018-10-14 14:49:32 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292540489 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292540971 - Carried out experiments to find the quantity of charge carried by electrons.
- An electron carries one unit of negative charge, and its mass is 1/1840 the mass of a hydrogen atom.

]]> 2018-10-14 14:53:30 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292540971 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292613191 - He found a way to reverse the direction of the Cathode ray and he called these Canal rays and concluded that they were made of positive particles.

]]> 2018-10-14 23:38:28 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292613191 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292614161 - confirmed the existence of the neutron - a particle with no charge and the same mass unit equal to the proton 

]]> 2018-10-14 23:47:48 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292614161 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615309 -

- After experimental test to find the current theory of atom structure, he proposed that the atom was mostly empty space which explained the lack of deflection of most alpha particles.
- All positive charge and almost all the mass are concentrated in a small region that has enough positive charge to account for the great deflection of some alpha particles
- He called this region the nucleus.

- His model was also known as " The Nuclear Atom"
- In the nuclear atom, the protons and neutrons are located in the nucleus. The electrons are disturbed around the nucleus and occupy almost all the volume of an atom. 
- the nucleus is tiny to the atom as a whole. 
- model was left unfinished. 
- the model couldn't explain the chemical properties of elements  ]]> 2018-10-14 23:57:16 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615309 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615990 2018-10-15 00:03:28 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615990 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615992 2018-10-15 00:03:30 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615992 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615993 2018-10-15 00:03:32 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292615993 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292617363 - proposed that an electron is found only in specific circular paths, or orbits, around the nucleus. 
- Each electron in his model had a fixed energy, and the energies an electron could have is called energy levels .
- gave results in agreement with experiments on hydrogen atoms, yet it failed to explain for energies absorbed and emitted, and with more than one electron .

]]> 2018-10-15 00:17:11 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292617363 waggle_p https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292735792 - used the results of past experiments to form a new equation describing the behavior of the hydrogen atom. 
- the quantum mechanical model - comes from mathematical solutions to the Schrodinger equation 
- The model determines the allowed energies an electron can have and how likely it is to find the electron in various locations around the nucleus. 
- The model shows how the electron is moving around the nucleus is similar to the motion of a propeller blade. 

]]> 2018-10-15 10:48:25 UTC https://padlet.com/waggle_p/iggvhs2zw0jw/wish/292735792