Element ,Atomic number,Mass number, Electrone distribution, velocity .table 20
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Hydrogen1 H 1Helium4 He 2Lithium7 Li 3Beryllium9 Be 4Boron11 B 5Carbon12 C 6Nitrogen14 N 7Oxygen16 O 8Fluorine19 F 9Neon20 Ne 10Sodium23 Na 11Magnesium24 Mg 12Aluminium27 Al 13Silicon28 Si 14Phosphorus31 P 15Sulphur32 S 16Chlorine35.5 ClArgon40 Ar 18Potassium39 K 19Calcium40 Ca 20
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the answer is on the top and other two elements are potassium and calcium
atomic number of potassium is 19,2,8,9.
calcium is 20,2,8,8,1,40
atomic number of potassium is 19,2,8,9.
calcium is 20,2,8,8,1,40
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