98 predicted 2 · 8 · 18 · 32 · 28 · 8 · 2

Californium, Cf, element 98

Actinide· Period 7· f-block

Configuration [Rn]5f107s2

Atomic weight
251Da
Phase
solid
Density
15.1g/cm³
Melting point
1,173.15K 900 °C
Boiling point
1,743K, predicted 1,470 °C
Electronegativity
1.3

Radioactive metallic transuranic element. Belongs to actinoid series. Cf-251 has a half life of about 700 years. Nine isotopes are known. Cf-252 is an intense Neutron source, which makes it an intense Neutron source and gives it a use in Neutron activation analysis and a possible use as a radiation source in medicine. First produced by Glenn T. Seaborg and associates in 1950. Description from mendeleev.

Back to the table
The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

4 of 5 fields have a value for californium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
251Da
Source: mendeleev
Electron configuration
[Rn]5f107s2
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d104f145s25p65d105f106s26p67s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 32 · 28 · 8 · 2
Source: Worked outfrom electron configuration

No data uncertainty of the atomic weight.