The periodic table can be used to find an element’s name, symbol, atomic number, protons, neutrons, electrons, and mass number.
Each element box shows important information. The symbol is a one- or two-letter abbreviation, and the atomic number tells how many protons an atom has.
In a neutral atom, the number of electrons is the same as the atomic number. If an atom gains or loses electrons, it becomes an ion, but it is still the same element.
The atomic mass is a weighted average of all the element’s isotopes. When you round the atomic mass to the nearest whole number, you get the mass number. To find the number of neutrons, subtract the atomic number (protons) from the mass number.
Examples were shown using elements like silver, potassium, tin, and fluorine, where the atomic number was used to find protons and electrons, the atomic mass was rounded to find the mass number, and neutrons were found by subtracting protons from the mass number.
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