1-2 Organizing The Elements

Organizing the Elements

Organizing Elements by Their Properties  Periodic

table- organizes information about the elements and their properties  Atomic mass- the average mass of one atom of an element  Mendeleev discovered that he could arrange the elements in a chart, or table, based on their physical and chemical properties

How was Mendeleev's system for organizing the elements shown to be reliable?

Today’s Periodic Table  Information

in periodic table based on structure of atoms  Elements are grouped in the periodic table according to their properties  Atomic parts- protons, neutrons, and electrons  Atomic number- the number of protons in the nucleus of its atoms

Navigating the table  Group-

elements in the same column, or

family  Elements in the same group have similar physical and chemical properties  Period- row across the table

Identifying patterns and properties You can classify an element and predict some of its physical and chemical properties based on the element’s location in the periodic table.

Metals •

Elements to the left of the line are metals

Nonmetals •

Elements to the right of the line are nonmetals

Metalloids •

Have properties sometimes similar to metals and other time to nonmetals