OCR GCE Chemistry - Electrons, Bonding and Structure
- Created by: Quincy Washington
- Created on: 02-12-10 18:04
What are electrons shells made up of?
-Sub-shells and orbitals
What is another name for en electron shell?
-Energy level
What are the numbers given to each energy level called?
-Principal Quantum number
Shells further from the nucleus have a greater energy level than shells ****** to the nucleus
-Closer
Name the first 4 sub-shells
-s,p,d,f
How many electrons can be held in each orbital?
-2
By how many orbitals do the sub-shells s,p,d,f increase by consecutively?
-2
How many orbitals in the s subshell?
-1
What is an orbital?
-An area of space that an electron moves in
What is the similarity between orbitals in the same sub-shell?
-Same energy
What is the term given to electrons having to spin in opposite directions within an orbital?
-Spin pairing
What is the shape of s orbitals?
-Sphere
What shape are p orbitals?
-Dumbbell shapes
At what angles are the 3 p orbitals arranged with eachother?
-At right angles (90°)
Name the three axes that p orbitals are arranged in
-x, y and z
What is the relationship between the 4s sub-shell and the 3d sub-shell? What does this cause?
-4s is at lower energy than the 3d sub-shell despite its principal quantum number being bigger
-4s sub-shell fills up first
What is the name given to the electronic configuration showing sub-shells?
-Sub-shell notation
What is the subshell notation for Helium?
-1s2
What do the symbols represent in the sub-shell notation?
-1: Energy level/shell (principal quantum number)
-2: Number of electrons
-s: Sub-shell
Lithium is Group 1 after Helium; give the noble gas electron configuration of Lithium
-[He]2s1
Electronic Structure decides the C******* P********* of an element
-Chemical Properties
Which groups contain s block elements? Which two anomalous elements are also in the s block but not in the groups listed?
-Groups 1 and 2
-Hydrogen and Helium
Which block are groups 5, 6 and 7?
-P block
What word is used to describe elements that don’t react i.e. noble gases?
-Inert
Where are the d block elements found on the periodic table?
-Transition metals
What do the d block elements tend to do in terms of electrons? What do they form?
-Loses and d electrons
-Positive ions
What amazing analogy referring to transport can be used to describe how orbitals are filled?
-Strangers filling up seats on a bus. Everyone tends to sit in their own seat till they’re forced to share.
Define First Ionisation Energy
-Energy required to remove 1 electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions
What type of process is ionisation? Why?
-Endothermic
-You must put energy in to ionise an atom or molecule
Write an equation for first ionisation energy of oxygen
-O(g) à O+(g) + e-
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