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Periodic table
 

Periodic table

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    Periodic table Periodic table Presentation Transcript

    •  
      • Atoms
      • All matter consists of tiny units
      • Consist of a nucleus in the centre surrounded by electron. Electron move around the nucleus following orbit
      • Atom is made up of particles that are even smaller called subatomic particles
      • 3 types of subatomic particles which are
      • Electron move around the nucleus at high speed
      • In neutral atom,
      • No of protons = No of electron
      Subatomic particles Charge Protons, p Positive charge (+1) Neutrons, n No charge (0) Electrons ,e Negative charge (-1)
    • Proton number and nucleon number Symbol of element
      • Nucleon Number
      • Is always the bigger number
      • Total no of protons+neutrons
      • Proton number
      • Is always the smaller number
      • Is equal to the no. of electron
      NOTE BOOK Terms Meaning Proton Number The no of protons in an atom Nucleon Number The total number of protons + neutrons in an atom No of neutrons = Nucleon number – Number of protons
    • Isotope
      • Atoms Of Different Elements
      • The same number of protons & electrons are found in atoms of the same element
      • Positive charge & negative charge of an atom is same (atom is neutral)
      • ISOTOPE
      • Atoms of the same element which contain the same no of protons but different number of neutron.
      NOTE BOOK
    • Isotope
      • It can also can be defined as atoms of certain elements with the same proton numbers but with different nucleon numbers.
      • Three important points to define isotopes.
      • Isotopes are different atoms of the same element.
      • Isotopes have the same number of protons or same proton numbers.
      • Isotopes have different numbers of neutrons or nucleon numbers.
      Although there are only 115 elements, there are MORE than 1700 ISOTOPES on the earth. NOTE BOOK
    • Hydrogen Isotope Each isotope is named by INSERTING THE NUCLEON NUMBER AFTER the name of element NOTE BOOK
    • EXERCISE 4.2
      • a) Complete the table below:
      • b) Complete the number of subatomic particles for isotopes of chlorine
      EXERCISE BOOK ATOM NUMBER OF PROTON NUMBER OF ELECTRONS NUMBER OF NEUTRONS V 7 7 W 8 9 X 9 10 ELEMENT ISOTOPE NUMBER OF PROTONS NUMBER OF ELECTRONS NUMBER OF NEUTRONS CHLORINE Chlorine-35 Chlorine-37
    • Periodic Table
    • Periodic Table
      • Elements are arranged in order of increasing proton number
      • Proton number increases from left to right and from top to bottom
      • GROUP: Vertical column
      • Elements in same group have similar chemical properties
      • PERIOD: Horizontal row
      • Chemical and physical properties gradually changed when crossing periods
      NOTE BOOK
      • There are 18 groups numbered from 1 to 18 and 7 periods numbered from 1 to 7
      • VERY REACTIVE METAL (Group 1-alkali metal and Group 2-alkaline earth metal)
      • HALOGENS (Group 17- non metal)
      • NOBLE (INERT GAS) (Group 18-stable and unreactive)
      • TRANSITION ELEMENTS (Group 3 to 12)
      • LANTHANIDE SERIES (Period 6)
      • ACTINIDE SERIES (Period 7)
      NOTE BOOK
    • Locations of metals, non- metals and semi-metals
      • METAL (Elements in Group 1 , 2 ,13 and transition metals)
      • NON-METAL (Elements in group 16 ,17 ,18)
      • SEMI-METAL (Elements between metal and non metal. Possess certain properties of metal and non-metal)
      NOTE BOOK
    • PERIODIC TABLE CARD GAME
    • Importance of periodic table
      • Helps us to study elements in orderly and systematic approach
      • Help us to know properties of elements because elements with similar properties are in same group
      • Help us to predict the properties and uses of an element
      NOTE BOOK