Page 40 - Curriculum Visions Dynamic Book. To close the book, close the tab.

Ruthenium (Ru) Ruthenium (Ru)
Element 44 on the periodic table. A silver-grey coloured metal and member of the transition metals. It is used to make alloys harder.
It was discovered in 1844 by the Russian chemist Karl Karlovich Klaus.
Rutherfordium (Rf)
Element 104 on the periodic table. An artificial radioactive element, also called unnilquadium (Unq), belonging to the transition metals. It was discovered in 1964 at the Joint Institute for Nuclear Research at Dubna, Russia. It has no practical uses. Rutherfordium is a transuranium element.
S
Salt
A compound, often involving a metal, that is the result of a reaction between an acid and a base or between two elements. ‘Salt’ is also the common word for sodium chloride – common salt or table salt.
Samarium (Sm)
Element 62 on the periodic table. A silvery-white metal belonging to the rare-earth metals and
one of the lanthanides. Samarium was discovered in 1879 by Paul-Émile Lecoq de Boisbaudran. It has few uses.
Scandium (Sc)
Element 21 on the periodic table. A soft, silvery-white metal, the first member of the rare-earth metals and one of the lanthanides. It was discovered in 1879 by Lars Fredrik Nilson. It has an unusually low density and high melting point, but few uses have so far been found for it.
Seaborgium (Sg)
Element 106 on the periodic table. An artificial radioactive element, also called unnilhexium (Unh), belonging to the transition metals.
It has properties similar to tungsten, which is just above
it on the periodic table. It was discovered in 1974 by Georgy
N. Flerov. It has no practical uses. Seaborgium is a transuranium element.
Selenium (Se)
Element 34 on the periodic table. A metalloid in group 6 (the oxygen group).
It was discovered in 1818 by the Swedish chemist Jöns Jacob Berzelius.
It has the unusual property that it conducts electricity much better when light falls on it. It can
also convert light into electricity. For these reasons it is used in photoelectric and solar cells. It also goes into red enamels and strengthens rubber.
Semi-conductor
A material of low electrical conductivity. Conductivity increases with temperature.
Semi-conductor devices often use silicon when they are made as part of diodes, transistors, or integrated circuits.
Elements lying between
metals and non-metals are also sometimes called semi-conductors. Examples of semi-conductors are silicon, germanium oxide and germanium.
(See also: Doping and Metalloid.)
Semi-metal
(See: Metalloid.) Series
A sequence of elements that have similar or related characteristics.
It may also be a part of a period (row) on the periodic table such as the actinide or lanthanide series.
 Selenium – This is a bank of photocells that use selenium as a light-sensitive electrical generator.
40