Notes
Atomic number: represents the number of protons and electrons
Atomic name (not shown in picture) Is next to the atomic weight
Atomic weight: The weight of the atom measured in amu
Atomic name (not shown in picture) Is next to the atomic weight
Atomic weight: The weight of the atom measured in amu
- Atomic mass units
Each element represents: an Atom
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Groups:
Run across the top of periodic table in a total of 18 groups. Groups on the table have similar properties. For example:Group 1 elements are highly reactive while group 18 elements are most non reactive/stable. Periods: There are 7 periods. Each period represents the number of energy shells an atom has. |
Roman Numerals:
Represent the number of valence electrons in the outer shell. Notice they only go up to eight.
I II III IV V VI VII VIII
(See Fig.3 Group one)
All 3 atoms have 1 valence electron because they’re in the same group. They have a different number of energy shells because they’re different in periods.
Represent the number of valence electrons in the outer shell. Notice they only go up to eight.
I II III IV V VI VII VIII
(See Fig.3 Group one)
All 3 atoms have 1 valence electron because they’re in the same group. They have a different number of energy shells because they’re different in periods.