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submitted by , Akshaya s prasadPhysical scienceRegno:18214383003

Submitted to , Linimol K.S Lecturer in Physical Science

MODERN PERIODIC TABLE

Born: :23 November 1887Weymouth,Dorset,United Kingdom Died :10 August 1915(aged 27)Gallipoli,Ottoman empire Nationality :British Fields :Physics , chemistry Education :Trinity College,University of OxfordUniversity of

ManchesterKnown forAtomic Number,Moseley's LawInfluencesErnest RutherfordNotable awardsMatteucci Medal(1919)

He proposed the modern periodic table

Henry moseley

Modern periodic table

The modern periodic table is the improved version of Mendeleev’s periodic table

Moseley modified Mendeleev’s periodic law accordingly

a. Properties of elements depend on their atomic number.

b. When elements are arranged in the ascending order of their atomic numbers there is a repetition of their properties at fixed intervals.

About the modern periodic table

ATOMIC NUMBER

The total number of electrons/protons present in an atom is called atomic number.

VALANCY It is the number of electrons donated, accepted or

shared to attain stability

1. There are 18 groups and 7 periods in the modern periodic table

2. Group-The vertical columns in the periodic table are called groups

3. Periods-The horizontal rows are called periods

4. Smallest period : 1st period 5. Largest period : 6th period6.

In the modern periodic table elements are divided in to three types

1. Metals2. Non metals3. Metalloids

1. S-block2. P-block3. d-block4. f-block

The elements are arranged in four blocks S-BLOCK

d-BLOCK

P-BLOCK

f-BLOCK

REPRESENTATIVE ELEMENTS

The elements of the group 1,2 and 13 to 18 ie, s and p block elements are called representative elements.

Some of their characteristics are,

Show periodic repetition of electronic configuration. There are elements belonging to different categories

like metals, non- metals, and metalloids. There is representation for elements in various

physical state. Similar properties are exhibited within the group.

The elements in group 3 to 12 that is the d-block elements are called transition elements.

TRANSITION ELEMENTS

Fourteen elements coming after lanthanum in sixth period of periodic table is called LANTHANONES /LANTHALNIDES

LANTHANONES

Fourteen elements coming after actinium in seventh period of periodic table is called actinones/actinides.

ACTINIDES

The noble gases make a group of chemical elements with similar properties.

They are all odorless, color less, monatomic gases with very low chemical reactivity.

The six noble gases that occur naturally are helium (He),neon (Ne),argon (Ar),krypton (Kr),xenon (Xe), and the radioactive radon (Rn).

For the first six periods of the periodic table, the noble gases are exactly the members of group 18 of the periodic table.

It is possible that due to relativistic effects, the group 14 element flerovium exhibits some noble-gas-like properties,

NOBLE GAS

The f-block elements are called innertransition elements that is the Actinoids and Lanthanoids.

INNER TRANSITION ELEMENTS

Group no. Name of the element family

No. of valence electron

Valency

1 Alkali metal family

1 1

2 Alkaline earth metal family

2 2

13 Boron family 3 3 14 Carbon family 4 4 15 Nitrogen family 5 3 16 Oxygen family 6 2 17 Halogen family 7 1 18 Noble gas

family 8 0

FAMILY NAMES

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