Electronic Structures

Q1: How many electrons can fit in the first shell?

Correct - The first shell is tiny - it's easy to fill.
Incorrect - the first shell holds 2 electrons, all other shells hold 8 electrons.
Incorrect - the first shell holds 2 electrons, all other shells hold 8 electrons.


Electronic Structures

Q2: Fluorine is drawn incorrectly below. Why is it incorrect?


incorrectly drawn fluorine atom
Well done! Fluorine should have nine electrons but only has 8 in the diagram.
Incorrect - The inner shell can only hold 2 electrons.
Incorrect - Fluorine has 9 electrons - it's the smaller of the two numbers (the atomic no.) on the periodic table.


Electronic Structures

Q3: Why is the element drawn below incorrect?


Incorrect drawing of a nitrogen atom
Incorrect - Nitrogen has 7 electrons - take a peek at the periodic table to check why.
Correct! Nitrogen has 7 electrons, 2 fill up the first shell leaving five for the second shell.


Groups, Periods and Electronic Structures

Q4: Look at the element drawn below, which group and period should it be in?


correctly drawn oxygen atom
Afraid not - you've got your groups and periods mixed up.
Well done - there are two shells, so oxygen is in period two and the outermost shell contains 6 electrons so oxygen is in group 6.
Incorrect - re-read the information page.


Groups, Periods and Electronic Structures

Q5: Name the element that has three electrons in its outer shell and two electron shells.

Incorrect - Aluminium is in group 3 however it is in period 3 not 2.
Incorrect - Fluorine is in period 2 but it is in group 7.
Correct - well done!.
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