Neptunium | Chemistry

Dexter High School, Dexter, Michigan, U.S.A.

Neptunium, 93, Dexter High School, Michigan, U.S.A.

Neptunium: Neptune, God of the Sea, is standing in front of the planet bearing his name. He is carrying his trident, a superior weapon, pointed towards Uranus, his creator. Neptunium (Np) was first synthesized in 1940 by the transmutation of the element uranium by neutron emission. Neptunium further transmutes into plutonium, Pu-238, his radioactive abs! Neptunium was made from the clay polymer FIMO and his hair from wool-locks. The background is foam board and acrylic paint.

Original artwork by Samantha Jaworski. Trident: Tia Scarpelli, Advanced Chemistry Class students. Teacher: Cheryl V. Wells, Dexter High School, Dexter, Michigan, U.S.A.

Atomic properties*

Name:

Neptunium

Symbol:

Np

Atomic number:

93

Atomic mass:

(237) amu

Melting point:

No data

Boiling point:

4131°C

Density:

20.2 g/cm³

Electronegativity:

1.3

# of Isotopes:

2

State:

Solid

Colour:

Silvery-metallic**

Classification:

Metallic**

* Haynes, W. M. (2011). CRC Handbook of Chemistry and Physics, 91st edition: http://www.hbcponline.com/ Retrieved April 7, 2011

** Winter, M. (2010). Home of the Periodic Table. Retrieved April 8, 2011, from Web Elements: http://www.webelements.com/