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54 terms

Periodic table of element-number 2nd

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Praseodymium
2+8+18+21+8+2
Neodymium
2+8+18+22+8+2
Promethium
2+8+18+23+8+2
Samarium
2+8+18+24+8+2
Europium
2+8+18+25+8+2
Gadolinium
2+8+18+25+9+2
Terbium
2+8+18+27+8+2
Dysprosium
2+8+18+28+8+2
Holmium
2+8+18+29+8+2
Erbium
2+8+18+30+8+2
Thulium
2+8+18+31+8+2
Ytterbium
2+8+18+32+8+2
Lutetium
2+8+18+32+9+2
Hafnium
2+8+18+32+10+2
Tantalum
2+8+18+32+11+2
Tungsten
2+8+18+32+12+2
Rhenium
2+8+18+32+13+2
Osmium
2+8+18+32+14+2
Iridium
2+8+18+32+15+2
Platinum
2+8+18+32+17+1
Gold
2+8+18+32+18+1
Mercury
2+8+18+32+18+2
Thallium
2+8+18+32+18+3
Lead
2+8+18+32+18+4
Bismuth
2+8+18+32+18+5
Polonium
2+8+18+32+18+6
Astatine
2+8+18+32+18+7
Radon
2+8+18+32+18+8
Francium
2+8+18+32+18+8+1
Radium
2+8+18+32+18+8+2
Actinium
2+8+18+32+18+9+2
Thorium
2+8+18+32+18+10+2
Protactinium
2+8+18+32+20+9+2
Uranium
2+8+18+32+21+9+2
Neptunium
2+8+18+32+22+9+2
Plutonium
2+8+18+32+24+8+2
Americium
2+8+18+32+25+8+2
Curium
2+8+18+32+25+9+2
Berkelium
2+8+18+32+27+8+2
Californium
2+8+18+32+28+8+2
Einsteinium
2+8+18+32+29+8+2
Fermium
2+8+18+32+30+8+2
Mendelevium
2+8+18+32+31+8+2
Nobelium
2+8+18+32+32+8+2
Lawrencium
2+8+18+32+32+9+2
Rutherfordium
2+8+18+32+32+10+2
Dubnium
2+8+18+32+32+11+2
Seaborgium
2+8+18+32+32+12+2
Bohrium
2+8+18+32+32+13+2
Hassium
2+8+18+32+32+14+2
Meitnerium
2+8+18+32+32+15+2
Darmstadtium
2+8+18+32+32+17+1
Roentgenium
2+8+18+32+32+18+1
Copernicium
2+8+18+32+32+18+2