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important groups: | | alkali metals | alkaline earth metals | halogens …

Question

important groups:

alkali metalsalkaline earth metalshalogensnoble 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?

Explanation:

Brief Explanations

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.

Answer:

Alkali MetalsAlkaline Earth MetalsHalogensNoble Gases
Valence Electrons1278 (2 for He)
What type (charge) ions are formed?+1+2-1None (stable)
Notable qualitiesReactive metalsReactive metalsReactive non - metalsNon - reactive gases

Elements are arranged by atomic number.
The number of valence electrons increases from left to right across the periodic table.