An atom is made from a nucleus surrounded by electrons which contan protons and neutrons
The Mass Number is the top number-The Atomic Number is the bottom number
An ISOTOPE is an atom that have the same number protons but different number of protons
The plum pudding model was the first model of an atomdiscovered by Rutherfood
- Isotopes
- The number of electrons in an atom is always the same as the number of protons so the atom is neutral
- The total number of protons and neutrons in an atom is its mass number
- Charged particles called ions are formed when atoms loose or gain electrons
- if an atom looses one or more electrons it becomes positively charged
- if an atom gains one or more electrons it becomes negitively charged
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