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Ch. 3 - Atomic Structure II. Masses of Atoms (p.75-80) Mass NumberIsotopes Relative Atomic Mass Average Atomic Mass C. Johannesson
A. Mass Number mass # = protons + neutrons always a whole number© Addison-Wesley Publishing Company, Inc. always a whole number NOT on the Periodic Table! C. Johannesson
B. Isotopes Mass # Atomic #Atoms of the same element with different mass numbers. Nuclear symbol: Mass # Atomic # Hyphen notation: carbon-12 C. Johannesson
B. Isotopes © Addison-Wesley Publishing Company, Inc. C. Johannesson
B. Isotopes Chlorine-37 atomic #: mass #: # of protons:# of electrons: # of neutrons: 17 37 20 C. Johannesson
C. Relative Atomic Mass 12C atom = 1.992 × 10-23 gatomic mass unit (amu) 1 amu = 1/12 the mass of a 12C atom 1 p = amu 1 n = amu 1 e- = amu © Addison-Wesley Publishing Company, Inc. C. Johannesson
D. Average Atomic Mass Avg. Atomic Massweighted average of all isotopes on the Periodic Table round to 2 decimal places Avg. Atomic Mass C. Johannesson
D. Average Atomic Mass EX: Calculate the avg. atomic mass of oxygen if its abundance in nature is 99.76% 16O, 0.04% 17O, and 0.20% 18O. Avg. Atomic Mass 16.00 amu C. Johannesson
D. Average Atomic Mass EX: Find chlorine’s average atomic mass if approximately 8 of every 10 atoms are chlorine-35 and 2 are chlorine-37. Avg. Atomic Mass 35.40 amu C. Johannesson
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Atomic Structure Nucleus – contains protons and neutrons
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Essential Question: How do atoms of the same element differ?
ISOTOPES Chemistry. I. Why Atoms Differ? A. Atoms of different elements have their own unique structures 1. Because they have different structures they.
Atomic Structure I. Subatomic Particles.
Mass Number Atomic Number equals the # of... NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE ATOM.
Isotopes Atoms of the same element that different mass numbers
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More about isotopes Atomic mass vs average atomic mass or atomic weight.
Atomic Number- the number of protons in the nucleus of an atom of that element Ex: Hydrogen atoms have only one proton in the nucleus, so the atomic.
Isotopes Atoms of the same element with different mass numbers. Mass # Atomic # Nuclear symbol: Hyphen notation: carbon-12 Courtesy Christy Johannesson.
Ch. 3 - Atomic Structure II. Masses of Atoms (p.75-80) Mass Number Isotopes Relative Atomic Mass Average Atomic Mass.
C. Johannesson Atomic Structure. Structure of the Atom Protons- Positively charged particles in the nucleus Neutrons-neutrally charged particles in.
Atomic Mass. Masses in amu Only carbon-12 has an atomic mass exactly equal to its mass # One atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12.
Isotopic Abundance SCH 3U. Atomic Mass The mass of an atom (protons, neutrons, electrons) Relative Atomic Mass: An element’s atomic mass relative to the.
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