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Both protons and neutrons have a mass of
1
Electrons
2000 x smaller
The number of protons and electrons of a neutral atom are
The same
Isotopes
Same number of protons and different number of neutrons
In an election dot diagram
The kernel of the atom is represented by the letter symbol for the element, and the valence electrons are represented by dots
An election
Has a smaller mass than a proton and a negative charge
The mass number is
Is the sum of protons and neutrons
The small dense nucleus contains
Both protons and neutrons and is located inside the electron shells of an atom
Energy is released when an excited electron
Falls to a lower energy level appears as light