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Question
important groups:
| alkali metals | alkaline earth metals | halogens | noble gases | |
|---|---|---|---|---|
| valence electrons | ||||
| what type (charge) ions are formed? | ||||
| notable qualities (metal/nonmetal, reactivity, state at room temp., etc.) |
periodic table organization:
how are elements arranged in the modern periodic table?
what happens to the number of valence electrons as you move from left to right across the periodic table?
Alkali Metals - Group 1, 1 valence e-, +1 ions, reactive metals. Alkaline Earth - Group 2, 2 valence e-, +2 ions, reactive metals. Halogens - Group 17, 7 valence e-, -1 ions, reactive non - metals. Noble Gases - Group 18, 8 (or 2 for He) valence e-, non - reactive gases. Elements arranged by atomic number. Valence electrons increase left to right.
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| Alkali Metals | Alkaline Earth Metals | Halogens | Noble Gases | |
|---|---|---|---|---|
| Valence Electrons | 1 | 2 | 7 | 8 (2 for He) |
| What type (charge) ions are formed? | +1 | +2 | -1 | None (stable) |
| Notable qualities | Reactive metals | Reactive metals | Reactive non - metals | Non - reactive gases |
Elements are arranged by atomic number.
The number of valence electrons increases from left to right across the periodic table.