CHEMISTRY Periodic Table

Researched triads that had similar chemical properties

Physical properties showed a trend that varied in an orderly way according to their atomic mass

Russian chemist who organized known elements into a periodic table and recognized that chemical and physical properties varied in an orderly way when elements arranged by increasing atomic mass

What did Mendeleev predict?

How is the modern periodic table arranged?

A horizontal row

A vertical column

Divides metals from nonmetals

8 valence electrons - Element is unreactive

Loses electrons when reacting to form a stable octet
Has 1-3 valence electrons
Found left of stair steps

Gains electrons when reacting to form a stable octet
Typically has 5-7 valence electrons
Found right of the stair steps (not including 8A)

Can gain or lose electrons when reacting to form a stable octet
Has 3-5 valence electrons
Found along the stair steps

Do not gain or lose electrons (don't react)
Has 8 (or 2) electrons
Found in rightmost column

Where are the groups and what are their names on the periodic table?

A base

Salt former

Oxygen family

What are family characteristics?

Properties of elements tend to repeat in a pattern when the elements are arranged in order of increasing atomic number

What are periodic properties?

What are the units for atom size?

Energy needed to remove the outermost valence electron from and atom in the gaseous phase

How does ionization energy increase?

What are reactivity trends?