Level 16
Level 18
15 words 0 ignored
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Ignore words
Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.
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Hydrogen
1
Helium
2
Lithium
3
Beryllium
4
Boron
5
Carbon
6
Nitrogen
7
Oxygen
8
Fluorine
9
Neon
10
Sodium
11
Magnesium
12
Aluminum
13
Silicon
14
Phosphorus
15
