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The atomic number is the number of protons. That is, the number of protons in the potassium (K) is 19. Electrons equal to protons are located in a circular shell (orbit) outside the nucleus. That is, the potassium (K) atom has a total of nineteen electrons.
There are nine protons in an ion with 10 electrons and a -1 charge. Likewise, how many protons does an ion with 10 electrons and a charge of +2 contain? O2- indicates an ion of oxygen having two extra electrons.
You can simply subtract the atomic number from the mass number in order to find the number of neutrons. If the atom is neutral, the number of electrons will be equal to the number of protons . Remember! 1. Your mass number is the total number of neutrons and protons within the atom.
What does that number of protons tell you. The number of protons tells you which element the atom is . The number of protons is the element number (Hydrogen - 1, Helium - 2, etc.).
The number on the bottom left corner is the atomic number , which tells you the number of protons. The number on the upper left corner is the mass number, which is equal to the neutrons and protons added together. Lastly, the charge is on the upper right corner.