Atoms very small, have atomic radius of 1 x 10-10m
- Contain three types of subatomic particle: Proton- Relative Mass of 1 and Relative Charge of +1; Neutron- Relative Mass of 1 and Relative Charge of 0; and Electron- Relative Mass of very small and Relative Charge of -1.
- Most of mass of atom in nucleus
- Atoms have no overally charge- contain equal number of protons and electrons
- All atoms of particular element have same number of protons
- Atoms of different elements have different number of protons
- Atomic Number- Number of protons
- Mass Number- Sum of protons and neutrons in atom
- Elements arranged in order of increasing atomic number in modern periodic table.
- number of protons = number of electrons
number of neutrons = mass number - atomic number
Question- How many protons, electrons and neutrons are there in Sodium?Answer- Sodium is Na 23, 11. 11 Protons; 11 Electrons; 12 Neutrons (23-11)
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