Write the number of neutrons of the first 20 elements.
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1
Answer:
Hydrogen. Atomic Number: 1. Symbol: H. Atomic Mass: 1. Protons : 1. Neutrons: 0. Electrons: 1. Helium.
Answered by
2
Answer:
Atomic
Number Symbol Name Atomic Mass
(amu, g/mol)
1 H Hydrogen 1.00797
2 He Helium 4.00260
3 Li Lithium 6.941
4 Be Beryllium 9.01218
5 B Boron 10.81
6 C Carbon 12.011
7 N Nitrogen 14.0067
8 O Oxygen 15.9994
9 F Fluorine 18.998403
10 Ne Neon 20.179
11 Na Sodium 22.98977
12 Mg Magnesium 24.305
13 Al Aluminum 26.98154
14 Si Silicon 28.0855
15 P Phosphorus 30.97376
16 S Sulfur 32.06
17 Cl Chlorine 35.453
18 Ar Argon 39.948
19 K Potassium 39.0983
20 Ca Calcium 40.08
Explanation:
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