Correct: Protons are positive , Protons tell us the identity of the element, Electrons are negative, Neutrons are neutral, Most of the atom's mass is the protons and neutrons, To find the number of neutrons in an atom, you have to subtract the atomic number and atomic mass number., The outermost shell of an atom is reserved for the valence electrons., Valence electrons tell us how reactive an element is, The magic number to make an atom inert is 8 (except helium with 2 valence electrons), The number of valence electrons tell us which group the element belongs in., The number of rings, shells, or orbitals tell us which period the element belongs in., Electrons are the smallest subatomic particles, and protons and neutrons are the same size., Incorrect: Protons are negative, Protons are neutral , Protons always change, The atom's mass is mostly electrons and protons, Electrons are neutral, To find the number of neutrons, you have to subtract the number of protons and electrons., The outermost shell is reserved for the protons., The protons tell us how reactive an element is., The magic number to make an atom inert is 10, The total number of electrons tell us which group number the element belongs in., The valence electrons tell us which period the element belongs in., Protons and electrons are the same size.,

Category 1: Atomic Structure

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