Atomic Structure Review Worksheet Key
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12
found below symbol on periodic table
Na
atomic number 11 is Sodium
4
mass – protons 7-3 = 4
10 protons = electrons
5 found by looking for the atomic number
4
mass found under symbol on periodic table
4
7
protons + neutrons
Protons
Electrons
Neutrons
Protons and neutrons
False (the nucleus is where all the mass is, but it takes up a small area)
True 0 atomic mass units for an electron 1 atomic mass unit for protons and neutrons
True The electron cloud is mainly empty space with electrons flying around
True
False John Dalton showed that atoms combine in whole number ratios
True
True
False 2 electrons fit on the 1st energy level, 8 can fit on the second
-2
(9-7 = 2) more electrons so: negative 2
+2
-1
-3
14
Mass is shown beside the name on an isotope
6
Carbon always has 6 protons: even the isotopes
8
mass – protons = neutrons 14-6 = 8
92
Found on the periodic table : Uranium always has 92 protons
17
33-16
Na
Because of the 11 protons
23
11 + 12
One
Valence electrons are the electrons on the outermost energy level
Electrons
Rutherford