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# Periodic table

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### Periodic table

1. 1. PERIODIC TABLE Genesis of Periodic Classification of Elements!
2. 2. STEPWISE DEVELOPMENT OF PERIODIC TABLE Dobereiner’s Law of Triads Newland’s Law of Octaves Mendeleev’s Old Periodic Law Moseley’s Modern Periodic Law
3. 3. DOBEREINER’S LAW OF TRIADS  In each group of three members called triads, the middle element had an atomic weight about half way between the atomic weights of the other two
4. 4. NEWLAND’S LAW OF OCTAVES The arrangement of the elements in increasing order of their atomic weights and noted that every eighth element had properties similar to the first element The relationship was just like every eighth note that resembles the first in octaves of music.
5. 5. NEWLAND’S TABLE This study awarded Davy medal
6. 6. MENDELEEV’S OLD PERIODIC LAW  Mendeleev’s Law (Old periodic law) states that “The properties of the elements are a periodic function of their atomic weights”  Mendeleev predicted the existence and properties of some elements and his prediction was absolutely correct  He called the groups as “columns” and periods as “series”
7. 7. MOSELEY’S MODERN PERIODIC LAW  Modern Periodic Law states that “The properties of the elements are a periodic function of their atomic numbers”  He said that the properties of every elements varies with atomic number not with atomic mass  The modern periodic table is in accordance with modern periodic law
8. 8. LONG FORM OF PERIODIC TABLE  Periodic table consists of seven periods numbered from 1 to 7 and the 7th period is still incomplete  Periodic table consists of eighteen groups numbered from 1 to 18  Pure metals are placed on left hand side and non metals on the right hand side  Hydrogen finds a separate and unique position in the periodic table because its property does not match with any other elements  Periodic table is divided into four main blocks depending upon where the last electron enters namely s-, p-, d- or f-blocks  The liquid metal present in periodic table is mercury (Hg) and the liquid non metal is bromine (Br)
9. 9. LATIN NAME FOR SOME ELEMENTS Sodium – Natrium (Na) Potassium – Kalium (K) Mercury – Hydrargyrum (Hg) Silver – Argentum (Ag) Gold – Aurum (Au) Tin – Stannum (Sn) Lead – Plumbum (Pb)
10. 10. THE END!
11. 11. PRESENTED BY NITHYA S NAIR Physical Science Badriya College Velichakkala Kollam
12. 12. THANK YOU