Chemistry- First 20 Elements Atomic number(rounded)
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Last updated 12:45 PM on 1/27/26
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20 Terms
1
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H
1
2
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He
4
3
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Li
7
4
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Be
9
5
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B
11
6
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C
12
7
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N
14
8
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O
16
9
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F
19
10
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Ne
20
11
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Na
23
12
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Mg
24
13
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Al
27
14
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Si
28
15
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P
31
16
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S
32
17
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Cl
35
18
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Ar
40
19
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K
39
20
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Ca
40
Note 
Flashcards (115)