C1.1.1: Atoms
- Created by: 009143
- Created on: 08-02-16 19:20
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- C1.1.1: Atoms
- All substances are made of atoms.
- A substance that ismade of only one sort of atom is called an element.
- There are about 100 different elements.
- Elements areshown in the periodic table.
- A substance that ismade of only one sort of atom is called an element.
- An atom contains three main parts:
- Protons
- The Nucleus
- It contains protons and neutrons.
- It’s in the middle of an atom.
- Has a positive charge overall.
- Are positively charged ( + )
- It is the number of protons in a nucleus which decides what type of atom it is.
- The Nucleus
- Electrons
- Move around the nucleus
- They occupy shells around the nucleus
- Are negatively charged ( - )
- Neutrons
- The Nucleus
- It contains protons and neutrons.
- It’s in the middle of an atom.
- Has a positive charge overall.
- Have no charge - neutral
- The Nucleus
- Protons
- The total number of electrons in an atom is always the same as the number of protons in the nucleus.
- This means there is no overall electrical charge in an atom.
- If some electrons are added or removed, the atom becomes charged
- The atom becomes an ion.
- The number of protons in an atom of an element isits atomic number.
- The sum of the protons andneutrons in an atom is its mass number.
- Electrons occupy particular energy levels.
- Each electron in an atom is at a particular energy level (in a particular shell).
- The electrons in an atom occupy the lowestavailable energy levels (innermost available shells).
- All substances are made of atoms.
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