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Paper 1
C2
Electron Shells
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Created by
Pav Bath
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Cards (15)
What do electrons occupy in an atom?
Electrons occupy
shells
(or
energy levels
).
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How do electron shells differ from snail shells?
Electrons
do not nibble on plants like snails do.
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What are the rules for filling electron shells?
The lowest
energy levels
are filled first.
Maximum
electrons
per shell:
1st
shell: 2 electrons
2nd
shell:
8
electrons
3rd
shell: 8 electrons
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How many electrons can the first shell hold?
The first shell can hold
2
electrons.
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How many electrons can the second shell hold?
The second shell can hold
8
electrons.
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What is the electronic structure of nitrogen?
The electronic structure of nitrogen is
2.5
.
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How many protons does nitrogen have?
Nitrogen
has
seven
protons.
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What does the periodic table indicate about an element's electrons?
The periodic table indicates the number of
protons
, which equals the number of electrons in a
neutral atom
.
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How do you determine the electronic structure of an element?
You follow the
electron shell
rules based on the number of
protons
.
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How does the electronic structure of argon look based on its protons?
The electronic structure of argon is
2.8.8
.
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How can you determine the number of shells and outer shell electrons of an element from the periodic table?
The number of shells is equal to the period of the element.
The
group number
indicates how many electrons are in the outer shell.
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What is the electronic structure of sodium based on its period and group?
The electronic structure of sodium is
2.8.1
.
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How many protons does sodium have?
Sodium has
11
protons.
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What is the maximum number of electrons in the third shell?
The maximum number of electrons in the third shell is
8
.
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Why is it easy to work out the electronic structure of elements?
Because the rules for filling
electron shells
are
straightforward
.
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