modern periodic table-23

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THE MODERN PERIODIC TABLE:

THE MODERN PERIODIC TABLE By, Sameer D. Deviads

Slide7:

The horizontal rows of the periodic table are called PERIODS.

Alkali Metals:

Alkali Metals Lithium Sodium Potassium Rubidium Cesium Francium

Alkaline Earth Metals:

Alkaline Earth Metals Beryllium Magnesium Calcium Strontium Barium Radium

Transition Metals:

Transition Metals

Transition Metals:

Transition Metals Elements in groups 3-12 Less reactive harder metals Includes metals used in jewelry and construction. Metals used “as metal.”

Boron Family:

Boron Family Elements in group 13 Aluminum metal was once rare and expensive, not a “disposable metal.”

Carbon Family:

Carbon Family Elements in group 13 Contains elements important to life and computers. Carbon is the basis for an entire branch of chemistry. Silicon and Germanium are important semiconductors .

Nitrogen Family:

Nitrogen Family Elements in group 15 Nitrogen makes up over ¾ of the atmosphere. Nitrogen and phosphorus are both important in living things. Most of the world’s nitrogen is not available to living things. The red stuff on the tip of matches is phosphorus.

Oxygen Family or Chalcogens:

Oxygen Family or Chalcogens Elements in group 16 Oxygen is necessary for respiration. Many things that stink, contain sulfur (rotten eggs, garlic, skunks, etc.)

Halogens:

Halogens

Halogens:

Halogens Elements in group 17 Very reactive, volatile, diatomic, nonmetals Always found combined with other element in nature . Used as disinfectants and to strengthen teeth.

Noble Gases:

Noble Gases

The Noble Gases:

The Noble Gases Elements in group 18 VERY non-reactive, monatomic gases Used in lighted “neon” signs Used in blimps to fix the Hindenburg problem. Have a full valence shell.

Slide38:

Why is the Periodic Table important ? The periodic table is the most useful tool to a chemist. You get to use it on every test. It organizes lots of information about all the known elements .

REFERENCES :

REFERENCES The story of chemistry by Anirban Hazra Science, Textbook for class X Chemistry, Textbook for class XI

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