Lanthanum (La)vsMendelevium (Md)
Mendelevium (Md) has a higher Atomic Mass (258 vs 139 u), while Mendelevium (Md) has a higher Atomic Number (101 vs 57), while Mendelevium (Md) has a higher Electron Affinity (94 vs 53 kJ/mol).
Atomic Properties
57
Atomic Number
101
139
Atomic Mass
258
6
Period
7
3
Group
3
Physical Properties
6
Density
N/A
1,193
Melting Point
1,100
3,737
Boiling Point
N/A
27
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
1
53
Electron Affinity
94
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).