The document discusses the history and development of the periodic table from 1789 to 1913. It describes the key properties and trends within the periodic table, including atomic size, ionization energy, and electron configuration across periods and groups. The periodic table is organized into 18 groups and 7 periods containing representative blocks of s, p, d and f orbitals. The properties of elements, such as their metallic/non-metallic nature, reactivity, and ability to form complexes depend on their position in the periodic table.

1. Submitted by,
Shamla R M
Reg. No. 18214357010
Physical science
B N V C T E Thiruvallam

2.  1789 Antoyal Lavosia Metals &Nonmetals
 1808 John Dalton Relative atomicmass
 1829 Dobarainer Law of Triads
 1864 Newlands Law of octaves
 1869 Mendaleev Periodic law
 1913 Henry Mosely Modern periodic law

3.  The Physical and Chemical properties of the
elements are periodic functions of their
atomic number
 Properties of an element depend upon the
atomic number

5. Groups : 18
Periods : 7
Blocks : s,p,d,f

6. ATOMIC SIZE
Along a group: increases (because No. of
shells increases)
Along a period :Decreases (new electron enter
into same shell)

7. Amount of energy required to remove
loosely held electron from an atom
Along a group : decreases
Along a period : increases

8. Amount of energy released or absorbed
when atom takes electrons to form
negative ion in a gaseous state
Along a group: increases
Along a period : decreases

9.  Electronic configuration :ns1-2
 The elements of group 1&2
 Last electron enter into the s-subshell
 Highly electropositive and reactive metals

10.  Last electron enter into the p- subshell
 Most p-Block elements are metals
&nonmetals
 16th &17th groups are highly electronegative
elements

11.  Last electron enter into the d-subshell
 All elements are pure metals
 Form coloured compounds
 Form complex compounds
 Known as transition metals

12.  Last electron enter into the f- subshell
 Two series of elements –Lanthanide
series&Actinide series
 All are metals
 Known as Inner transition metals

13. 1st group
2nd group
13
14
15
16
17
18
 Alkali metals
 Alkaline earth metals
 Boron family
 Carbon family
 Nitrogen family
 Oxygen family
 Halogen family
 Noble gases