First 20 elements

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20 Terms

1
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1 Hydrogen (H)

1

2
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2 Helium (He)

4

3
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3 Lithium (Li)

7

4
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4 Beryllium (Be)

9

5
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5 Boron (B)

10,81 → 11

6
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6 Carbon (C)

12

7
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7 Nitrogen (N)

14

8
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8 Oxygen (O)

16

9
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9 Fluorine (F)

19

10
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10 Neon (Ne)

20

11
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11 Sodium (Na)

23

12
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12 Magnesium (Mg)

24

13
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13 Aluminium (Al)

27

14
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14 Silicon (Si)

28

15
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15 Phosphorus (P)

31

16
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16 Sulfur (S)

32

17
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17 Chlorine (Cl)

35,5

18
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18 Argon (Ar)

39,9 → 40

19
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19 Potassium (K)

39

20
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20 Calcium (Ca)

40