The Structure of the Atom. The Building Block of Matter. Atoms are the smallest particles of an element that retains the chemical properties of that element. Parts: Nucleus – small region in the center of the atom. (+ charged protons, = charged neutrons)
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The Building Block of Matter
(+ charged protons, = charged neutrons)
If an atom was the size of a sports stadium, the nucleus would be the size of a marble!
Quark Calculations(for protons and neutrons)
Each proton is 2 up quarks and 1 down quark
2(2/3) – 1(1/3) = 4/3 – 1/3 = 3/3 or +1
Each neutron is 2 down quarks and 1 up quark
2(-1/3) + 2/3 = 0
Each electron is composed of 2 down quarks
3(-1/3) = -1
Element symbol – Mass # (rounded)
Example: Helium He-4
Superscript Mass Number, Subscript Atomic Number, Symbol