Atoms Ions And Isotopes Worksheet Answer Key
______ Date_________________ ISOTOPES, IONS AND ATOMS Worksheet Atomic # = number of protons. Mass # = atom # + neutrons. Protons = electrons when the charge is zero. Atom ## p+ # e- 1) 17 2) 180 3) 4) 92 # n0 Value 19 Mass # 0 71 40 238 109 38 Symbol 46 86 206 5) Pb4+ 82 6) 34 – 8 4 8 . 2 49 0 31 9) P3- 15 10) 83 80 126 108 11) Ag 47 12) 116 49 +3 13) 128 53 -1 14) 76 188 72 Name ____________________________________________________
Atomic Structure And Symbolism
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Daniel Davis: October 2008 Archives
Chemist. The mass of an atom is equal to the sum of # neutrons + # protons. ● # neutrons = atomic mass – # protons Atomic symbol name # Mass # # protons # neutrons # electrons Selenium se 34 79 34 45 34 rn 86 86 radon 222 86 136 Au 79 79 gold na 71 2 the sodium atom is the same element with the number of neutrons Different. ● Isotopes are distinguished by adding mass numbers to names and symbols. Atomic Symbol Name # Mass # # Proton # Neutron # Electron 235 92 U 238 U 92 Carbon-12 Carbon-13 Ions Atoms can gain or lose electrons to become ions. ● ● Metals are cations and tend to lose electrons to become positively charged. # protons > # electrons ● Nonmetals are anions and the tendency to gain electrons becomes negative. # of protons < # of electrons ● Ions are distinguished from atoms by combining the electric charge as a superscript with the symbol of the element. Atomic symbol name # mass # # protons # neutrons # electrons Cation or 14 anion? Aluminum Al+3 13 27 13 13 Iron cation Fe 26 56 26 30 24 cation 15 31 18 phosphorus anion p 9 19 15 16 9 fluoride anion F-1 9 10 All mixed
● Complete the table below by indicating whether the element is an atom, ion or isotope. Symbol name Atom, ion, isotope? Atom # Mass # # protons # neutron # electrons P-3 15 29 Copper-63 18 35 30 19 30 10 4 4 Be+2 Argon Particle Diagram ● Draw the electrons and show the number of protons and neutrons in each atom, ion, and isotope below. Oxygen-16 Oxygen-2 Oxygen-17
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