Write the atomic masses, electron dot structure with their valencies of elements having atomic number 1 to 20
Answers
The atomic masses, electron dot structure with their valencies of elements having atomic number 1 to 20
Explanation:
Element :
It is a substance that cant be broken into more simpler substances .
Atomic number : It is number of protons present in an atom .
Mass number/Atomic mass : It is sum of protons and neutrons in an atom .
S.no Element atomic number E.configuration atomic mass
1. Hydrogen 1 1 1
2. Helium 2 2 4
3. Lithium 3 2,1 6
4. Beryllium 4 2,2 9
5. Boron 5 2,3 10
6. Carbon 6 2,4 12
7. Nitrogen 7 2,5 14
8. Oxygen 8 2,6 16
9. Fluorine 9 2,7 18
10 Neon 10 2,8 20
11 sodium 11 2,8,1 23
12 Magnesium 12 2,8,2 24
13 Aluminium 13 2,8,3 27
14 Silicon 14 2,8,4 28
15 Phosphorous 15 2,8,5 31
16 Sulphur 16 2,8,6 32
17 Chlorine 17 2,8,7 35
18 Argon 18 2,8,8 40
19 Potassium 19 2,8,8,1 39
20 Calcium 20 2,8,8,2 40
Valencies :
H-+1
He=0
Li=+1
Be=+2
B=+3
C=+-4
N=-3
O=-2
F=-1
Ne=0
Na=+1
Mg=+2
Al=+3
Si=+4
P=-3
S=-2
Cl=-1
Ar=0
K=+1
Ca=+2
Explanation:
Atomic to 30 Let us Number of Elements from 1 take a look at what is the atomic mass of elements from 1 to 30.
there are three photos
see the attachment
