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It has 26 protons.
80 protons and 121 neutrons
Mass number = 24 = 12 protons, 12 neutrons
Helium is a non metal element. There are 2 electrons in a single atom.
107
21
three
Bohr studied the spectrums of various atoms and generalized his quantum theory from his discoveries. He concluded that the electrons of an atom determined many of its characteristics.
2 miles abve sea leve;
Bohr theory was introduced using hydrogen atom, it's not applicable to each and every atom, even for the other isotopes of hydrogen.
2
Bohr was a Danish scientist who is known for his creation of the Bohr model, a flat model showing all shells in an atom and many others.You should probably check out Wikipedia,http://en.wikipedia.org/wiki/Niels_Bohrfor more information, for I am probably not the expert on the subject. :)