Periodic Classification of Elements

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Element

A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.

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Element
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Isotopes

Isotopes are variants of atoms of a particular chemical element, which have differing numbers of neutrons.Carbon Isotopes are shown in the slide.

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Isotopes
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Isotopes of Hydrogen

Slide below shows the isotopes of hydrogen.

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Isotopes of Hydrogen
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Valency

Valency of an element is determined by the number of valence electrons present in the outermost shell of its atom.

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Valency
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Atomic Size

The atomic size of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the nucleus to the boundary of the surrounding cloud of electrons.

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Atomic Size
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Classification of Elements

Elements can be classified into metals and non-metals.

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Classification of Elements
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Metals and Non-metals

Difference between metals and non-metals.

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Metals and Non-metals
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Johann Wolfgang Döbereiner

Johann Wolfgang Döbereiner was a German chemist who arranged the elements with similar properties into groups.

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Johann Wolfgang Döbereiner
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Döbereiner Triads

According to Döbereiner in certain triads(groups of three elements) the atomic mass of the central element was merely the arithmetic mean of the atomic masses of the other two elements.

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Döbereiner Triads
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John Newlands

John Newlands was an English scientist who arranged the then known elements in the order of increasing atomic masses.

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John Newlands
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Newland's Law of Octaves

Newland arranged the then known elements in the order of increasing atomic masses.

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Newland's Law of Octaves
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Newland's Law of Octaves Table

Newland arranged the elements in Octaves.

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Newland's Law of Octaves Table
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Dmitri Ivanovich Mendeleev

Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He is credited as being the creator of the first version of the periodic table of elements.

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Dmitri Ivanovich Mendeleev
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Mendeleev's Periodic Table

Slide below shows the Mendeleev's Periodic Table.According to Mendeleev the properties of elements are the periodic function of their atomic masses.

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Mendeleev's Periodic Table
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Trends of Periodic Table

Trends of periodic table are shown in the slide.

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Trends of Periodic Table
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Group and Periods

Mendeleev’s Periodic Table contains vertical columns called ‘groups’ and horizontal rows called ‘periods’.

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Group and Periods
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Modern Periodic Table

The Modern Periodic Table has 18 vertical columns known as ‘groups’ and 7 horizontal rows known as ‘periods’.

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Modern Periodic Table
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Noble Gases

Noble gases are a group of chemical elements with very similar properties.

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Noble Gases
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Noble gases in Periodic Table

Slide shows the place of noble gases in periodic table.

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Noble gases in Periodic Table
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Noble Gases

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

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Noble Gases
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