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what is the rare element in period 4, what is the lowest atomic mass lanthanide, what is the lowest atomic number actinide, lowest atomic number transuranium element,element with isotopic mass 209, element filling a 3d sublevel in Group 6/VIB, elements with five valence electrons in period 5,element with ten 4d electrons in period 5
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1. Rare element in period 4
??
2. Lowest atomic mass lanthanide
Lanthanum, La = 138.91 amu
3. Lowest atomic number actinide
Actinium, Ac=89
4. Lowest atomic number transuranium element
Rutherfordium, Rf = 104
5. Element with isotopic mass 209
Polonium, Po
6. Element filling a 3d sublevel in group 6/VIB
Chromium, Cr
7. Element with 5 valence electrons in period 5
Antimony, Sb
8. Elements with 10 4d electrons in period 5
Pd, Ag, Cd, In, Sn, Sb, Te, I, Xe