Atomic Structure
- Created by: Abc312
- Created on: 30-03-18 13:46
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- Atomic Structure
- Atoms
- Have a nucleus
- In the middle of the atom
- Has Protons
- Relative mass of 1
- Positive charge
- The amount of protons decide what that atom is
- Has Neutrons
- Relative mass of 1
- No charge
- 1/10000 of the radius of the atom
- The mass is concentratedhere
- Has electrons
- Move around in shells
- Virtually no mass
- Negative charge
- They cover a lot of space
- The size of their orbits determines the size of the atom
- Have no overall charge
- Same number of protons and electrons
- Nuclear Symbols tell you about the atom
- The top number is the mass number
- It tells you the total number of protons and neutrons
- The bottom number is the Atomic (proton) number
- This tells you the number of protons
- The top number is the mass number
- Represented by a one or two letter symbol
- Have a radius of about 0.1nm (1 x 10^-10 m)
- Have a nucleus
- Elements
- Elements are a collection of atoms with the same atomic number
- Isotopes are different forms of the same element
- They have the same number of protons but a different number of neutrons
- Same atomic number, different mass number
- Elements exist as a number of different isotopes so relative atomic mass is used (Ar)
- To find Ar add each isotope abundance times the mass number of that isotope
- Then divide by the sum of all abundances of all the isotopes
- To find Ar add each isotope abundance times the mass number of that isotope
- They have the same number of protons but a different number of neutrons
- Compounds
- Atoms react with each other to make compounds
- They are held together by chemical bonds
- Can be hard to separate.
- Represented by formulas
- For example CO is carbon monoxide. It has one Carbon atom and one Oxygen atom
- Formed from elements in chemical reactions
- Mixtures
- No chemical bonds between the different parts
- Can be made from elements or compounds
- Can be separated fairly easily
- Usually with a physical method
- Meaning a chemical reaction does not need to be used so nothing new is formed
- Usually with a physical method
- The chemical properties of each substance in the mixtureremain unchanged,
- ElectronicStructure
- The electrons in an atom fill up the shells getting further away from the shell.
- When full the first shell contains 2 electrons and further shells contain8 electrons.
- Atoms
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