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Atomic radius increases down group

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I.E increase across period and decreases down group

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Atomic radius increases along the period

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Arranged by properties

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S d p f sections

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Yes

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decreases in reactivity down period 7

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Increasing electronegative towards the right and decreasing electronegative downwards

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left to right gets more electronegative
top to bottom gets less electronegative

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Electronegativity of the element's atoms increases across the period (from left to right)

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Sophie- reactivity increases down group 1

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The elements are arranged in groups which show how many electrons are in the outer shell. The period shows how many shells the element has.

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In order of increasing atomic number

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The elements in the periodic table are arranged in terms of their chemical properties, electronic configuration and atomic number

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Ordered in increase of proton number - christine

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ordered by atomic number, groups decided by atoms in outer shell, decreasing electro negativity down groups, increasing electro negativity along periods

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Corey
Arranged by properties, electron configuration and number of protons
The further down a period an element is the easier it is for removal of elecrotrons

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Arranged by similar properties and structure and in ascending order of mass and atomic number. - Albuin

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Go up in atomic numbers down the periodic table

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left to right gets more electronegative
top to bottom gets less electronegative

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Arranged to their properties

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arranged by there properties
the atomic number and mass increase as you go along

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The are arranged based on the properties and on electron configuration.