18 Groups (vertical) and 7 Periods (horizontal). Group 1: Alkali Metals. Group 17: Halogens (most reactive non-metals).
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Use tricks to remember the Reactivity Series or the Periodic Table groups. 18 Groups (vertical) and 7 Periods (horizontal)
Isotopes: Same atomic number, different mass number (e.g., Carbon-12 and Carbon-14). Isobars: Same mass number, different atomic number. 3. Periodic Table Classification The Modern Periodic Table was developed by . different mass number (e.g.
Metals are malleable and ductile; Non-metals are generally brittle.