Notes on Subatomic Particles. proton. neutron. There are 3 subatomic particles in an atom: 1. 2. 3. electron. nucleus. Electrons. (negative). Proton Neutron. (positive). (neutral). 1 amu (atomic mass unit). positive. nucleus. (p + ). neutral. nucleus. 1 amu. (n).
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There are 3 subatomic particles in an atom:
(atomic mass unit)
Atomic mass #
Atomic mass # :
Atomic # :
To find the # of neutrons:
Atomic mass # - atomic # = # neutrons
He organized it by increasing mass
(doesn’t work…look at #27 and #28)
and by similar properties
Rows () – periods, shells, energy levels,
Columns (↕) – groups, families, # of valence
Left of Zig Zag Line - metals, cations (positive ions)
Zig Zag Line – metalloids, semi-metals, semiconductors
Right of ZigZag Line – non-metals, anions (negative ions)
* Column 5 (15) – Nitrogen Family
**Note: Only Down to Zig Zag line for Oxygen Family and Nitrogen Family!!
Middle of the periodic table …