Periodicity

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Flashcards on Periodicity, created by I Shouldn't be awake on 19/04/2018.
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Flashcards by I Shouldn't be awake, updated more than 1 year ago
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Resource summary

Question Answer
Group meaning OSE
Period Highest energy level
S/P/D block Which subshell the highest energy electron(s) in
S/P/D groups S - 1/2 P - 13->18 D - 3->12
Ionisation energy definition Energy required to remove one electron from each atom of one mole of gaseous atoms
Factors influencing IE Charge ^ = IE ^ Radius ^ = IE decrease Shielding ^ = IE decrease
What is shielding Inner shell electrons repel outer shell electons
Predictions from IE and why OSE - From IE trends Determine group from OSE
Trends in periodic table IE ^ across a period (^ charge, smaller radius, same shielding). Decreases down a group (larger radius, more shielding).
Be -> B Electron in B in a p orbital, higher energy level, therefore less energy must be inputted to reach IE to remove it.
N->O P orbitals in N are singly occupied Shared pair in O, repel each other, makes it easier to remove.
Trends in mpt across Period 2+3: Increases across from Group 1->14 Decrease between 14+ 15
Why decrease? Giant covalent -> simple molecular
Where DON'T these trends continue? From period 4 onwards the D block elements don't adhere to these rules S and P block elements DO however.
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