An ionic compound, Barium selenide or BaSe is formed, with the ions Ba2+ and Se2-.
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Selenium dioxide, SeO2
This isotope is shown in hyphen notation: on the left side of the hyphen is the isotope's name, and on the right side is the isotope's mass number. The mass number of an element is the total number of particles in the nucleus (the number of protons + neutrons an atom has).In order to get the number of protons an atom has, find its atomic number on the periodic table. Selenium's atomic number is 34.... wait, this doesn't make any sense. If it has a mass number of 30 and an atomic number of 34, it has -4 neutrons.I'm sorry, but it looks like you have the problem wrong.
It is the characteristic colour of a barium flame.
89.3
Can be used in Fluoirescent tubes and also make Paint, Bricks, Tiles, Glass and Rubber.