ICSE Class 10 Answered
name the element in correct order of their increasing atom atomic numbers present in the first second and third short period of the periodic table state each element electronic configuration
Asked by addysahu7 | 31 May, 2019, 04:18: PM
Expert Answer
First period contains 2 elements (Hydrogen and Helium) which has atomic numbers 1 and 2 respectively.
Second period contains 8 elements (Li, Be, B, C, N, O, F, Ne) which as atomic numbers 3, 4, 5, 6, 7 and 8 respectively.
Third period contain 8 elements (Na, Mg, Al, Si, P, S, Cl, Ar) which has atmoic numbers 9, 10, 11, 12, 13, 14, 15 and respectively.
|
Name |
Atomic Number |
Electron Configuration |
|
Period 1 |
||
|
Hydrogen |
1 |
1s1 |
|
Helium |
2 |
1s2 |
|
Period 2 |
||
|
Lithium |
3 |
1s2 2s1 |
|
Beryllium |
4 |
1s2 2s2 |
|
Boron |
5 |
1s2 2s22p1 |
|
Carbon |
6 |
1s2 2s22p2 |
|
Nitrogen |
7 |
1s2 2s22p3 |
|
Oxygen |
8 |
1s2 2s22p4 |
|
Fluorine |
9 |
1s2 2s22p5 |
|
Neon |
10 |
1s2 2s22p6 |
|
Period 3 |
||
|
Sodium |
11 |
1s2 2s22p63s1 |
|
Magnesium |
12 |
1s2 2s22p63s2 |
|
Aluminum |
13 |
1s2 2s22p63s23p1 |
|
Silicon |
14 |
1s2 2s22p63s23p2 |
|
Phosphorus |
15 |
1s2 2s22p63s23p3 |
|
Sulfur |
16 |
1s2 2s22p63s23p4 |
|
Chlorine |
17 |
1s2 2s22p63s23p5 |
|
Argon |
18 |
1s2 2s22p63s23p6 |
Answered by Sivanand Patnaik | 02 Jun, 2019, 08:04: PM
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