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Protons, electrons and neutrons worksheet Finding the number of protons, neutrons and electrons in an atom Fill in the missing information for each element Element symbol B Atomic Number 5 Number of protons 5 Number of electrons 5 Number of neutrons 6 Mass Number* 11 190 34 30 36 86 Au 200 0 19 8 Cr 55 27 Ag 26 83 22 Sg Rapid Review: Keep a periodic table handy to solve this puzzle. Atomic symbol is the symbol you find for each element shown in the periodic table. Magnesium symbol is Mg Gold symbol is Au Potassium symbol is K Phosphorous symbol is P Note: First letter of the element is not always the symbol. Atomic number is the number on the top left of atomic symbol in periodic table Atomic mass is the number just below the atomic symbol. For example Boron has an atomic number of 5 and mass number of 11. (Mass number can be rounded off) Atomic number is always equal to the protons as well as the number of electrons in any element. Number of neutrons is given by subtracting atomic number from mass number. So Boron has 5 protons, 5 electrons and 6 neutrons.