EssentialQuestion:

How are the elements organized?

THE PERIODIC TABLE

Dmitri Mendeleyev AlkaliPeriodic Table Alkaline

earthPeriod TransitionGroup/Family HalogensNoble gasesMetalsNonmetalsMetalloids

VOCABULARY

Families of the Periodic Table

CONCEPT

Russian chemist who first tried to classify elements based on their properties.

His table was ordered by atomic MASS (which has been changed today).

DMITRI MENDELEYEV

Chart that organizes information about the elements.

Each box contains: Chemical symbol, Atomic Mass, and Atomic Number.

Today is organized by Atomic NUMBER.

PERIODIC TABLE

Horizontal Rows on the periodic table.

Numbered 1-7.

PERIOD

Also called: FAMILY

Vertical columns on the periodic table.

Elements in same group/family have similar properties.

GROUP

Left of step-like line.Shiny luster.Malleable – made into thin sheets.Ductile – stretched into wires.Solid.Conduct heat & electricity.

METALS

Group 1.Most reactive metals – combine with other elements.

ALKALI METALS

Sodium

Group 2.Also very reactive elements.

ALKALINE EARTH METALS

Magnesium

Groups 3-12.Give off characteristic colors.

TRANSITION METALS

TransitionMetals

Along step-like line.Some characteristics of metals AND nonmetals.

METALLOIDS

Metalloids

Silicon

Right of step-like line.Dull.Not conductors.Gases or solids.

NONMETALS

Group 17.Most reactive nonmetals.Halogens + Alkali metals = Salts.

HALOGENS

Group 18.Least reactive.Inert – do not react naturally.

NOBLE GASES