trends in the periodic table
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14 Terms
what is electronegativity
how much an atom in a compound attracts the electrons it shares
what happens to electronegativity going a cross a period
electronegativity increases
why does electronegativity increase across a period
decreased atomic radius
more protons within a nucleus
stronger attraction between nucleus and bonding pair of electrons in a covalent bond
what happens to electronegativity going down a group
electronegativity decreasing going down a group
why does electronegativity decrease down a group
atomic radius decreases
electron shielding increases
weakened attraction between nucleus and bonding pair of electrons in a covalent bond
why do noble gasses have no measurable electronegativity
full outer electron shell
rarely form bonds with other elements
electronegativity is only meaningful when bonding occurs
what happens to ionisation energy and electron affinity going across a period (left to right)
ionisation energy increases going left to right
electron affinity increases going left to right
what happens to ionisation energy and electron affinity going up a group
ionisation energy increases going up a group
electron affinity increases up going up a group
what happens to reactivity in metals going down a group?
reactivity in metals increases going down a group
what happens to reactivity in metals going across a period (right to left)
reactivity in metals increases as you go right to left
why does reactivity in metals increase going down a group and across a period
decreasing ionisation energy and atomic radius causes an increase in reactivity
what happens to reactivity in non metals going up a group
reactivity in non metals increases going up a group
what happens to reactivity in non metals going across a period ( left to right)
reactivity in non megatons increases going left to right
why do non- metals increase in reactive going up a group and left to right across a period
electronegativity increases
electron affinity increases
Note 
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