8 Atomic Number on the Periodic Table 11NaAtomic NumberSymbol
9 All atoms of an element have the same number of protons 11Na11 protonsSodium
10 Learning Check #1State the number of protons for atoms of each of the following:A. Nitrogen1) 5 protons 2) 7 protons 3) 14 protonsB. Sulfur1) 32 protons 2) 16 protons 3) 6 protonsC. Barium1) 137 protons 2) 81 protons 3) 56 protons
11 Number of Electrons An atom is neutral The net charge is zero Number of protons = Number of electronsAtomic number = Number of electrons
12 Mass NumberCounts the numberofprotons and neutronsin an atom
13 Atomic Symbols Na atomic number 11 Show the mass number and atomic numberGive the symbol of the elementmass numbersodium-23atomic number 11Na
14 16 31 65 8 15 30 More Atomic Symbols O P Zn 8 p+ 15 p+ 30 p+ O P Zn8 p p+ 30 p+8 n 16 n 35 n8 e e e-
15 IsotopesAtoms with the same number of protons, but different numbers of neutrons.Atoms of the same element (same atomic number) with different mass numbersIsotopes of chlorinechlorine chlorine - 37ClCl
16 Learning Check #2Naturally occurring carbon consists of three isotopes, 12C, 13C, and 14C. State the number of protons, neutrons, and electrons in each of these carbon atoms.#P _______ _______ _______#N _______ _______ _______#E _______ _______ _______CCC666678666
18 Learning Check #3 An atom of zinc has a mass number of 65. A. Number of protons in the zinc atom1) ) ) 65B. Number of neutrons in the zinc atomC. What is the mass number of a zinc isotopewith 37 neutrons?1) ) ) 67
19 Learning Check #4Write the atomic symbols for atoms with the following:A. 8 p+, 8 n, 8 e- ___________B. 17p+, 20n, 17e- ___________C. 47p+, 60 n, 47 e- ___________O168Cl3717Ag10747
20 Learning Check #5 16 14 14 An atom has 14 protons and 20 neutrons. A. Its atomic number is1) ) ) 34B. Its mass number isC. The element is1) Si 2) Ca 3) SeD. Another isotope of this element is1) ) ) 36XXX
21 Masses of AtomsA scale designed for atoms gives their small atomic masses in atomic mass units (amu)An atom of 12C was assigned an exact mass of amuRelative masses of all other atoms was determined by comparing each to the mass of 12CAn atom twice as heavy has a mass of amu. An atom half as heavy is 6.00 amu.
22 Na 22.99 Atomic Mass Listed on the periodic table Gives the mass of “average” atom of each element compared to 12CAverage atom based on all the isotopes and their abundance %Atomic mass is not a whole number
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