How to remember chemical numbers with atomic numbers easily
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Ok I presumed you do not mean the whole periodic table but only the first two periods in the table.
This is how I remember it. The first two period elements have a pattern, going from hydrogen with atomic number 1, we go to helium with a filled 1s orbital, so it is atomic number 2. Then the other remaining elements of period two fall into group 1 to group 8, respectively, so what you do is to add one consecutively to the atomic number of helium 2 to form lithium(3), berillyum (4), boron(5), carbon(6), nitrogen (7), oxygen (8), fluorine(9), Argon(10). This repeats itself, from sodium(11), magnesium(12), Aluminium(13), silicon(14), phosphorous(15), sulphur(16), chlorine(17), Neon(18)
This is how I remember it. The first two period elements have a pattern, going from hydrogen with atomic number 1, we go to helium with a filled 1s orbital, so it is atomic number 2. Then the other remaining elements of period two fall into group 1 to group 8, respectively, so what you do is to add one consecutively to the atomic number of helium 2 to form lithium(3), berillyum (4), boron(5), carbon(6), nitrogen (7), oxygen (8), fluorine(9), Argon(10). This repeats itself, from sodium(11), magnesium(12), Aluminium(13), silicon(14), phosphorous(15), sulphur(16), chlorine(17), Neon(18)
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