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Atoms

Chem

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Protons, Neutrons, and Electrons Practice Worksheet Fill in the blanks in the following worksheet. Please keep in mind that the isotope represented by each space may NOT be the most common isotope or the one closest in atomic mass to the value on the periodic table. Atomic symbol Atomic number Protons Neutrons Electrons Atomic mass B 6 11 24 31 37 39 89 29 35 43 100 Pb 207 102 70 89 225 Mo 53 81 206 100 159 No 261 Yb 172 106 159 Finding Protons, Neutrons, and Electrons of Elements

Biochemistry powerpoint

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Chapter 2 The Chemical Context of Life Basic Terms Element = cannot be broken down to other substances Examples: Na, O, C, Cl Compound = combination of 2 or more different elements Examples: NaCl, CO2, CH4 Requirements for Life 92 natural elements? 25 are essential to life Carbon, oxygen, hydrogen, and nitrogen make up 96% of living matter Trace elements are needed, too, though Iodine?lack of = goiter!! Atomic Structure Atom = smallest possible amount of an electron that retains the element?s properties Subatomic particles: Protons = + charge Electrons = - charge Neutrons = neutral charge Atomic Structure Atomic Number: # of protons (also equals # of electrons?) Mass Number: # of protons + # of neutrons Examples Isotopes
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