KChapter 8 Geologic Time Give It Some Thought: Understanding Isotopes 11 of 14 4

Question

KChapter 8 Geologic Time Give It Some Thought: Understanding Isotopes 11 of 14 4.003 sharing electrons Atomic weight Name of element Noble gases 1.0080 Lanthanide series Actinide series 4.003 6.939 Lithium Beryllium 14.007 159994 18.94 20.183 Boron Cbn Nitrogen Oxygen Fluorine Neon 9.012 2.011 Tendency to lose electrons Al 26.98 22.83024 35.453 39.848 28.08 Silican Phasphorua Sulfur Chlorne Argan 30.974 32.064 V Cr Mn Fe Co Ni Calcium Scandium Tnanium Vanadium Chromium Manganese IronCobalt Nicke Copper Zinc Gallum Cu Zn Ga Ge As SeBr Kr 83.80 39.102 40.0 44.96 47.80 50.94 52.00 54.94 55.85 58.83 63.54 65.37 9.72 72.59 9.909 Arsenic Selanium BromineKrypton 38 39 Zr Nb Mo Tc Ru Rh Pd A 87.82 88.91 95.94 102.90 12.40114.82 118.89 127.80 128.90 Aubidium Strontium Yttrium Zrconium Niobium Molybdenum Technetium Ruthenium Rhadium Paladium Silver Cadmium Indium n Antimony Tellurium ladine Xenon 56 #57 72 1 137.34| #71 Hafnium 78.49 183.85 185.09 204.37 207. 19 208.98 Cesium Bariun Tantalum Tuigsten Ahenium Osmium Iridiun Piatinum GoldMercury Thailium Le Bismuth PoloniumAstatine #89 #103 226.05 La Ce P Nd Pm Sm Eu Gd Tb 138.91 Ho Er Tm Yb Lu 64.93 (223) 15882 162 68.83 173.04 Cerium Praseodymium Neodymium Promethium Samanium Europium Gadolinium Terbium Dysprosium Holmium Erbium ThuliumYtterbium Lutetiunm 99 100 101 102 103 Ac Th Pa U N 227) 232.04231 238.03 2 Pu Am Cm Bk Cf Es Fm Md No Lw )(254)(253256)254) (257) 247) g the appropriate items into their respective bins. Refer to the periodic table of elements iew Available Hint(s) Reset | | He Pb (lead) C (carbon) K(potassium) K (potassiumP (lead) 7 neutrons 22 neutrons C (carbon) 125 neutrons 6 neutrons 20 neutrons 124 neutrons Atomic number19 Mass number 39 Atomic number6 Mass number 13 Atomic number 6 Mass number 12 Atomic number19 Atomic number 82 Mass number 207 Atomic number8 Mass number 206 Mass number 41

Explanation / Answer

as we know from the basics Atomic number is the number of protons present in an atom of an element.

so, Atomic no.= no. of protons

and Atomic mass= no. of protons + no. of neutrons

or number of neutrons= Atomic mass - Atomic no.

from given 1) atomic no.=19 ; mass no.=39

protons+ neutrons=39 , so neutrons =39-19=20 = K(potassium 20 neutrons)

2) atomic no.= 6 ; mass no.=13

protons+ neutrons=13, so neutrons=13-6= C( carbon 7 neutrons)

3) atomic no.=6; mass no.=12

protons+neutrons= 12 so neutrons=12-6= 6 =(carbon 6 neutrons)

4) atomic no.19; mass no.=41

P+N=41 so N=41-19= 22 neutrons (potassium)

5) atomic no.=82 ; mass no= 207

P+N=207 so N=207-82= 125(Pb)

6) last one obviously belongs to Pb( 124 neutrons)

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