Notes
Atomic History
Content of the notes (7)
Page 1
Atoms
Particles that make up all substances in the universe
Made up of : Protons, Neutrons & Electrons
Nucleus
Nucleus is a dense bundle of Protons and Neutrons. Protons have positive charge whereas Neutrons have no charge.
Page 2
Electrons
Electrons spin around in the space surrounding the nucleus. They are negatively charged and are attracted towards Positive Nucleus. Number of electrons is same as number of Protons therefore atom is neutral.
Page 3
Elements
Atoms are the smallest unit. Element is made up of more atoms. There are 118 elements out of which 26 are not found on earth.
Compounds
It is made up of two or more elements. The most compound NaCl (salt) is made up of Sodium and Chlorine.
Page 4
Atomic Number
The number of protons in the nucleus of an atom is known as Atomic Number.
Page 5
Metals Vs Non-Metals
The metals become more reactive as you go down the group and less reactive as you go left to right.
The non-metals become less reactive as you go down the group and more reactive as you go left to right .
Page 6
Electron Configuration
Fills electrons from the lowest shell
If there are more than 4 electrons in a shell they pair up
Page 7
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- Year 10 Chemistry Note on Atomic History, created by Kay Singh on 30/04/2018.
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- Kay Singh
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