What is the atomic number of the element Boron?
5
The atomic number of an element is the number of protons in the nucleus of its atom, which equals the number of electrons in a neutral atom.
Boron (symbol B) is a metalloid placed in Group 13 and Period 2 of the periodic table, just after beryllium.
Its atom has 5 protons, with the electronic configuration 2, 3, so its atomic number is 5.
Hence, 5.
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