Atomic StructurePARTS OF THE ATOM
WHAT DO THE NUMBERS MEAN?
Learning Targets:
I can arrange the atomic particles by size (DOK 1) I recognize the significance of the number of protons
in an atom and how that number relates to the identity of the atom (DOK 1)
I can relate the atomic number of an atom to the number of electrons in a neutral atom (DOK 2)
I can explain and interpret the numbers and symbols on the periodic table (DOK 1 and DOK 3)
Atomic Particles
Particle Charge Mass # Location
Electron -1 0 Electron Cloud
Proton +1 1 Nucleus
Neutron 0 1 Nucleus
What is an atom made up of? Atomic Particles:
Proton Identifier for the atom, keeps electrons attached to the
atomSlightly smaller than the neutron
NeutronStabilize the atom Slightly larger than the proton
ElectronAllowing for atoms to bond to other atomsSmallest of the 3 subatomic particles
What makes up the subatomic particles?
What is the smallest thing on earth?
Please click on the above link to watch the video.
What do the numbers and letters on the periodic table mean?
Atomic Number
Atomic Symbol
Element Name
Atomic Mass
Atomic Number
This is the number of protons in the nucleus, of an atom…. ALWAYS!
Think of it like an atom’s DNA It is what makes an element an element
It also tells you how many electrons are in a STABLE atom. Protons = electrons in stable atoms
ATOMIC NUMBER
Recognizing Atomic Numbers:Element Atomic Number
Lithium (Li)
Sulfur (S)
8
Carbon (C)
11
Atomic Number Practice:Element Atomic Number # of Protons # of Electrons
Nitrogen
17
10
8
6 6
Atomic Mass
Is the number of protons PLUS the number of neutrons in the nucleus of an atom.
Unit is Atomic Mass Units (AMU’s)
Atomic Mass
Atomic Mass:
Mass # = p+ + n0
*plug in what you know, and you can determine the mass, the number of neutrons, the number of protons, or the element.
Element # of protons # of neutrons # of electrons Mass #
Oxygen 8 8 8 16
Arsenic 33 42 33 75
Phosphorous 15 16 15 31
Complete this chart in your notes:
Element # of Protons # of Electrons
Atomic # Atomic Mass # of Neutrons
Carbon 6 6 6 12 6
Sulfur 16
Sodium 11
79
27 14
Helium (He) 4
20
Polonium (stable)
84
Lead 82
Check your work:
Element # of Protons # of Electrons
Atomic # Atomic Mass # of neutrons
Carbon 6 6 6 12 6
Sulfur 16 16 16 32 16
Sodium 11 11 11 23 12
Gold (Au) 79 79 79 197 118
Aluminum 13 13 13 27 14
Helium 2 2 2 4 2
Calcium 20 20 20 40 20
Polonium (Stable)
84 84 84 209 125
Lead 82 82 82 207 125
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