1️⃣[Ln]🌍
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#lanthanum
#lanthanide series
#first lanthanide
#rare earth element
#ree
#f-block element
#group 3
📊🔚✨
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#lutetium
#last lanthanide
#lanthanide series finale
#periodic table position
#f-block element
#element 71
1️⃣⚛️⛓️
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#actinium
#actinide series
#first actinide
#element 89
#f-block element
#lanthanum #lanthanide series #first lanthanide #rare earth element #ree #f-block element #group 3