Question

What are the first 20 elements​

Answer 1

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  The first 20 elements are also a good overview of the different element groups. They also occur in more everyday chemical reactions. The elements are listed in order of increasing atomic number. The atomic number is the number of protons in atoms of each element.

In order of increasing atomic number, the first 20 elements and their symbols are:

1. Hydrogen (H)
2. Helium (He)
3. Lithium (Li)
4. Beryllium (Be)
5. Boron (B)
6. Carbon (C)
7. Nitrogen (N)
8. Oxygen (O)
9. Fluorine (F)
10. Neon (Ne)
11. Sodium (Na)
12. Magnesium (Mg)
13. Aluminum (Al)
14. Silicon (Si)
15. Phosphorus (P)
16. Sulfur (S)
17. Chlorine (Cl)
18. Argon (Ar)
19. Potassium (K)
20. Calcium (Ca)

Answer 2

Answer:

The first 20 elements of the periodic table are:

1. Hydrogen (H)
2. Helium (He)
3. Lithium (Li)
4. Beryllium (Be)
5. Boron (B)
6. Carbon (C)
7. Nitrogen (N)
8. Oxygen (O)
9. Fluorine (F)
10. Neon (Ne)
11. Sodium (Na) - - - - - (Natrium) (Latin name because of sign change)
12. Magnesium (Mg)
13. Aluminium (Al)
14. Silicon (Si)
15. Phosphorous (P)
16. Sulphur (S)
17. Chlorine (Cl)
18. Argon (Ar)
19. Potassium (K) - - - - - (Kalium)
20. Calcium (Ca) - - - - - (Calx)

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