1.Periodic Properties & Variations of Properties Class 10 ,ICSE.pptx

(i) Periodic properties and their variations in groups and periods.

(ii) Periodicity on the basis of atomic number for elements.
1.atomic size
2. ionisation POTENTIAL/
3,electron affinity
4. metals
non metals
5. density
Periodic Trends
Periods
groups
Mendeleev periodic table
Moseley periodic table
long form of periodic table

1. The  periodic table also known as the  periodic table  of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. 

2. Period –In The Modern Periodic Table A  period  is a horizontal row of the periodic table.  There are seven periods in the periodic table, with each one beginning at the far left.  A new period begins when a new principal energy level begins filling with electrons. 

3. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.   Periods 4 and 5 have 18 elements.  Periods 6 and 7 have 32 elements because the two bottom rows that are separated from the rest of the table belong to those periods.  They are pulled out in order to make the table itself fit more easily onto a single page.

4. Property Trends Of Elements- From left to right Number of Electrons Shells : Remain Same Valence Electrons : Increases By One Non –Metallic Character : Increases

5. Groups In The Modern Periodic Table A group is a vertical column of the periodic table, based on the organization of the outer shell electrons.   There are a total of 18 groups .  

6. Property Trends Of Elements –On moving Down a Subgroup Valence Electrons : Remains Same Chemical Properties : Remains Similar Metallic Character : Increases

7. Periodic Properties of Elements 

8. Periodicity In Properties Repetition of  properties  after a certain interval is called  periodicity  of  properties . If  elements  are arranged in increasing order of their atomic number in the  periodic table , then  elements  repeat its  properties  after a definite interval. This repetition of  properties  is known as  periodicity  of  properties .

9. Atomic Radius Atomic radius  is the distance from the centre of the nucleus to the outermost shell containing electrons.

10. Factors Affecting Atomic Size: Number of Shells: Atomic size increases with the increase in the number of electronic shells. ... Nuclear  Charge : As the nuclear  charge  increases the atomic radius decreases due to increase in the attractive force on the outermost electrons.

11. Factors affecting Ionization Potential Atomic Radius- Increases in atomic radius decrease in I.P Nuclear Charge- Increase in Nuclear Charge Increase In I.P

12. Electron Affinity The electron affinity  of an atom or molecule is  defined  as the amount of energy released when an electron is added to a neutral atom or molecule  ...

13. Factors Affecting E.A Atomic Radius- Increases in atomic radius decrease in I.P Nuclear Charge- Increase in Nuclear Charge Increase In I.P

14. Electronegativity   is a measure of the tendency of an atom to attract a bonding pair of electrons when in a compound

15. The  metallic character   of an  element   can be defined as how readily an atom can lose an electron. From right to left across a period,  metallic character  increases because the attraction between valence electron and the nucleus is weaker, enabling an easier loss of electrons

16. Non-metallic character – relates to the tendency to accept electrons during chemical reactions. Non-metallic tendency – increases going from left to right across the periodic table.