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Hace 18 horas · Neptunium is a hard, silvery, ductile, radioactive actinide metal. In the periodic table, it is located to the right of the actinide uranium, to the left of the actinide plutonium and below the lanthanide promethium. [7] Neptunium is a hard metal, having a bulk modulus of 118 GPa, comparable to that of manganese. [8]
- silvery metallic
- [237]
- 93
- a = 666.3b = 472.3c = 488.7
Hace 18 horas · Phobos ( / ˈfoʊbəs /; systematic designation: Mars I) is the innermost and larger of the two natural satellites of Mars, [10] the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. It is named after Phobos, the Greek god of fear and panic, who is the son of Ares (Mars) and twin brother of Deimos .
- 2.138 km/s
- Mars
- 1640±8 km²
