Russian Chemist Dmitri Mendeleev produced the first periodic table of elements He arranged them in order of increasing atomic mass and noticed a periodic.

The Periodic TableBy Ryan Schutte

Beginnings

Russian Chemist Dmitri Mendeleev produced the first periodic table of elements

He arranged them in order of increasing atomic mass and noticed a periodic repetition of their properties

Mendeleev knew he was not completely correct with his table and left blank spots showing places where he thought an undiscovered element existed

Mendeleev’s Table

What is the Periodic Table?

The Table of Elements is a display of the chemical elements organized on the basis of their properties and presented in increasing atomic number.

Periodic Law

When elements are arranged in order of increasing atomic number, their physical and chemical properties show a periodic pattern

Modern Periodic Table

Has 109 squares, each representing an element

Squares aligned in vertical columns called groups› Elements in these groups have similar

properties Horizontal groups are called periods The Periodic table has 7 periods and

18 labeled groups

Groups

Some groups are given family names Groups on at the far left and right of the periodic

table are very similar within their group and are commonly referred to by their family names

Examples are the alkali metals, alkaline earth metals, halogens, and the noble gases

Metals, Nonmetals, and Metalloids

Metals- on the left side of the table› share many properties and are

characterized by their luster or shine› Good conductors of heat and electricity› Typically solids and room temperature› Malleable and ductile

Metals, Nonmetals, Metalloids cont.

Nonmetals- right side of the table except hydrogen› Do not have metallic luster› Poor conductors of heat and electricity› Neither malleable or ductile› Many are gases at room temperature and

others are solids

Metals, Nonmetals, Metalloids cont.

Metalloids- have properties of metals and nonmetals

Located in between metals and nonmetals in a staircase pattern

Periodic Table Trends- Atomic Radius

Atomic Radius- distance from the center of an atom’s nucleus to its outermost electron

If you go down each group on the periodic table, the atomic radius increases

If you left to right across each period, the atomic radius decreases

Ionization Energy

The energy needed to remove one of its electrons

Think of it as how strongly an atom holds onto its electrons

High ionization energy means atoms hold onto their electrons very tightly

Ionization energy decreases as you go down a group

Increases as you move from left to right across a period

Electronegativity

Ability to attract electrons in a chemical bond

Increase as you move left to right across a period and decrease as you move down a group

GOOD LUCK