Mixtures, Elements and Compounds A Matter of Fact Mixtures, Elements and Compounds

HENRY MOSELEY DEVISED THE MORDERN PERIODIC TABLE ARRANGING ELEMENTS AS PER THEIR ATOMIC NUMBER.

What is a Periodic Table? It is a tabular display of Chemical Elements. It is classified into : Alkali Metals, Alkaline earth metals, transition metals metalloids, halogens, noble gases, rare earth metals

PERIODIC TABLE

ELEMENTS CATEGORY IN THE periodic table Metals Metalloids Nonmetals Unknown chemical properties Alkali metals Alkaline earth metals Inner transition metals Transition metals Post-transition metals Other nonmetals Halogens Noble gases Lanthanides sActinides

What is a Periodic Table? It is a tabular display of Chemical Elements. It is classified into : Metals, alkaline earth metals, metalloids, halogens, transition metals, noble gases, rare earth metals

Metals Very “reactive metals”, do not occur freely in nature. Such metals are soft, malleable, ductile, good conductors of heat and electricity. Malleable - can be beaten into thin sheets. Ductile - can be stretched into wire. Possess metallic luster. Solid at room temperature (except Hg). Examples : Lithium, sodium, potassium, copper, mercury

copper

Non Metals Present in Group 14, 15, 16 Exist in room temperature as gases (Oxygen) and solids (Carbon). Very brittle-if a solid cannot be rolled into wires (Nonductile). Cannot be pounded into sheets Cannot conduct heat and electricity, do not reflect light. Do not possess metallic luster. E.g: Hydrogen, Nitrogen, Carbon, Oxygen

Noble Gases Present in Group 18 of the periodic table. Very low reactivity colorless, odorless, tasteless This group has lots of uses. E.g : helium, neon, Argon, Krypton, Xenon, Radon.

neon and helium or argon -- used In light bulbs. Laser lights Xenon headlights are found in BMW cars

TASK Download the tasks from the website: Atomic Wksht 1