Organization and Trends Periodic Table Organization and Trends

Periodic Trends If you look at the Periodic Table, you will notice several trends… take a look at it now (pg. 172 in your text) and see if you can notice any

Color-coded to show similar elements Alkali metals Ex: Sodium (Na) Shiny, soft, silvery, highly reactive metals Alkaline earth metals Ex: Calcium (Ca) Shiny, silvery-white, somewhat reactive metals Transition metals Ex: Copper (Cu) Hard, high BP and MP, barely reactive metals Halogens Ex: Flourine (F) Highly reactive non-metals Noble gases Ex: Helium (He) Odorless, colorless, very non-reactive non-metals

Atomic number increases LR, top to bottom

Periods are the rows of elements

Groups are the columns that go top bottom

Metal elements decrease in reactivity from LR; Non-metals increase in reactivity from LR Less Reactive  Most Reactive R  LR (Halogens are very non-reactive, and are not shown here) Most Reactive  Least Reactive | Least  Most Reactive Reactive

Organization Summary Elements are listed by their atomic number from 1 – 118 from LEFT to RIGHT, top to bottom PERIODS = the rows that go from LR Group/ Family = the columns that go from TOP BOTTOM Reactivity ranges from very reactive (L side) non- reactive (R side) for both metals and non-metals

Element’s state of matter Elements can exist in various states of matter (solid, liquid, gas)