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PNE . . .

PNE. Protons Neutrons Electrons. A positively charged subatomic particle ( found in the nucleus ). Proton. Neutron. A subatomic particle with no charge (found inside the nucleus ). Atomic Number.

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PNE . . .

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  1. PNE . . . Protons Neutrons Electrons

  2. A positively charged subatomic particle (found in the nucleus). Proton Neutron A subatomic particle with no charge (found inside the nucleus).

  3. Atomic Number The number of protons in the nucleus of an atom of that element. (This is also the number of electrons) Atomic number

  4. Atomic # Symbol Element’s Name Atomic Mass

  5. Mass Number Mass number is the number of protons and neutrons in the nucleus of an isotope. Mass # = p+ + n0 16 8 8 16 Arsenic 66 33 66 Phosphorus 15 15 30

  6. Mass Number & Atomic Mass • The number of protons (+) and electrons (-) in an atom are the same (as long as the atom is neutral). • The number of protons and neutrons (0) is not always the same.

  7. Isotopes Isotopes are atoms of the same element that have diff. masses because of diff. numbers of neutrons.

  8. Warm Up 9/16 If you have a 65 formative average and a 72 summative average, what would your grade be?

  9. Avg. Atomic Masses Atomic mass is the average of all the naturally occurring isotopes of that element. Carbon = 12.011 6 6 6

  10. Practice What is the average atomic mass of Lithium if 7.42% exists as Li and 92.58% exists as Li? Find the average atomic mass: 78.70% Mg, 10.03% Mg, 11.17% Mg 6 7 24 25 26

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