1.4 Subatomic Particles and Isotopes Obj. 3:b,e,f; 4

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Presentation transcript:

1.4 Subatomic Particles and Isotopes Obj. 3:b,e,f; 4 Chemistry

Essential Questions What is atomic # and how do you determine it? How is atomic # used to identify an element? What is mass # and how do you determine it? What is the difference between atomic mass and mass number? What is an isotope? How do you determine the number of protons, neutrons, and electrons for an isotope?

Atomic Number Atomic number is the number of protons. How do you find the atomic number? Periodic table How do we use atomic number? Identifies the type of element because each element has its own unique atomic number The atomic number of a neutral atom is equal to number of electrons

Mass Number Mass number is the total number of protons and neutrons in an atom (mass number = # of protons + # of neutrons) Mass number can be used to find the number of neutrons # of neutrons = Mass number - # of protons

Symbol Notation There are two way of doing symbol notation. Mass Number (A), Atomic Number (Z), and element symbol (X) Element name – mass number

Isotopes Isotopes are atoms of the same element that have different mass numbers Carbon – 14 and carbon – 12 The protons and electrons (if neutral) will be the same for isotopes of the same element The neutrons and mass number will be different for isotopes of the same element

Isotopes (cont) Element Proton Neutron Electron 1 26 30 2 25 3 27 32 4 29 Which of the above would be isotopes of the same element? Which would have the same mass number? 1 and 4 2 and 4

Atomic Mass The atomic mass is an average mass based off of the abundance and mass of the different isotopes and is found on the periodic table. amu – atomic mass unit When the atomic mass is rounded to the nearest whole number that is the most common isotope of the element Tc atomic mass is 97.9 so a mass number of 98 is the most common isotope

Protons, Neutrons, and Electrons Determine the number of p, n, and e- Cobalt – 58 Barium – 138 204Tl 227Ac In (round the mass to the most common isotope) Yttrium

Protons, Neutrons, and Electrons (cont) Fill in the following chart Element Shorthand (AX) Atomic # Protons Neutrons Electrons Mass # 159Tb 159 46 60 87 223 116 77 12 24

Protons, Neutrons, and Electrons (cont) Answer Key Element Shorthand (AX) Atomic # Protons Neutrons Electrons Mass # 159Tb 65 94 159 106Pd 46 60 106 223Fr 87 136 223 193Ir 77 116 193 24Mg 12 24

Protons, Neutrons, and Electrons (cont) Fill in the following chart Element Osmium-191 Osmium-190 Protons Neutrons Electrons Element Protons 57 Neutrons 81 83 Electrons

Protons, Neutrons, and Electrons (cont) Answer Key Element Osmium-191 Osmium-190 Protons 76 76 Neutrons 115 114 Electrons Element Lanthanum-138 Lanthanum-140 Protons 57 Neutrons 81 83 Electrons 57

Essential Questions What is atomic # and how do you determine it? How is atomic # to the identify an element? What is mass # and how do you determine it? What is the difference between atomic mass and mass number? What is an isotope? How do you determine the number of protons, neutrons, and electrons for an isotope?

1.4 Tracked Assignment 1.4 Worksheet