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If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false