Proton A nuclear particle having a positive charge equal to that of the electron and a mass more than 1800 times that of the electron The number of.

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Presentation transcript:

Proton A nuclear particle having a positive charge equal to that of the electron and a mass more than 1800 times that of the electron The number of protons in an atom is called the atomic number, Z. An element is a substance whose atoms have the same number of protons and thus the same atomic number, Z.

Neutron A nuclear particle having a mass almost equal to that of the proton but no electrical charge The mass number, A, is the total number of protons and neutrons in the nucleus. Isotopes are atoms whose nuclei have the same atomic number (number of protons) but different numbers of neutrons (mass number).

Fig. 2.13

Nuclide An atom characterized by a certain atomic number, Z, and mass number, A. Nuclide symbol Examples:

Atomic Definitions I: Symbols, Isotopes,Numbers X A Z X = Atomic symbol of the element, or element symbol A = The Mass number; A = Z + N Z = The Atomic Number, the Number of Protons in the Nucleus N = The Number of Neutrons in the Nucleus Isotopes = atoms of an element with the same number of protons, but different numbers of Neutrons in the Nucleus The Nuclear Symbol of the Atom, or Isotope

Write the nuclide symbol for the atom that has 19 protons and 20 neutrons. Atomic number: Z = 19 The element is potassium, K. Mass number: A = = 39 The nuclide symbol is

Depicting the Atom Fig. 2.14

Neutral ATOMS 51 Cr = P + (24), e - (24), N (27) 239 Pu = P + (94), e - (94), N (145) 15 N = P + (7), e - (7), N(8) 56 Fe = P + (26), e - (26), N (50) 235 U =P + (92), e - (92), N (143)

Atomic Mass The average atomic mass for the naturally occurring element expressed in atomic mass units (amu) (Note that this is a weighted average of the relative abundances and masses of the isotopes.) Atomic Mass Unit Equal to exactly one-twelfth the mass of a carbon- 12 atom

Isotopes of Hydrogen 1 1 H 1 Proton 0 Neutrons % amu 2 1 H (D) 1 Proton 1 Neutron % amu 3 1 H (T) 1 Proton 2 Neutrons The average mass of Hydrogen is amu 3 H is Radioactive with a half life of 12 years. H 2 O Normal water “light water “ mass = 18.0 amu, BP = C D 2 O Heavy water mass = 20.0 amu, BP = C

Figure 2.9: A representation of two isotopes of carbon.

Figure 2.11: Diagram of a simple mass spectrometer.

Figure 2.12: The mass spectrum of neon.

Element #8 : Oxygen, Isotopes 16 8 O 8 Protons 8 Neutrons % amu 17 8 O 8 Protons 9 Neutrons 0.037% amu 18 8 O 8 Protons 10 Neutrons % amu

Calculating the “Average” Atomic Mass of an Element 24 Mg (78.7%) amu x = amu 25 Mg (10.2%) amu x = amu 26 Mg (11.1%) amu x = amu amu With Significant Digits = 24.3 amu Problem: Calculate the average atomic mass of Magnesium! Magnesium Has three stable isotopes, 24 Mg ( 78.7%); 25 Mg (10.2%); 26 Mg (11.1%).

Problem: Calculate the abundance of the two Bromine isotopes: 79 Br = g/mol and 81 Br = g/mol, given that the average mass of Bromine is g/mol. Plan: Let the abundance of 79 Br = X and of 81 Br = Y and X + Y = 1.0 Solution: X( ) + Y( ) = X + Y = 1.00 therefore X = Y ( Y)( ) + Y( ) = Y Y = Y = or Y = X = Y = = %X = % 79 Br = x 100% = 50.67% = 79 Br %Y = % 81 Br = x 100% = 49.33% = 81 Br

An element has four naturally occurring isotopes. The mass and percentage of each isotope are as follows: Percentage AbundanceMass (amu) What is the atomic weight and name of the element?

To find the portion of the atomic weight due to each isotope, multiply the fraction by the mass of the isotope. The atomic weight is the sum of these products. Fractional Abundance Mass (amu)Mass From Isotope The atomic weight is 207 amu; the element is lead.

2.(8 points) Atoms X, Y, Z, and R have the following nuclear compositions: Which two are isotopes of each other? Circle them and explain.

6. (11 points) Fill in the blank spaces and write out all the symbols in the left hand column in full, in the form (i.e. include the appropriate values of Z and A as well as the correct symbol X and the charge, if any).

Symbol# protons#electrons#neutrons Ar Au

(15 points) Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (isotopic mass = amu) and 7Li (isotopic mass = amu). Lithium has an atomic mass of amu. What is the percent abundance of lithium-6?