Question

send the energy​ level of atomic no. 21 to 30 basically quantom no.

Answer 1

Here is a list of 1 to 30 elements with respective symbols and atomic numbers:-

Atomic No. Element Symbol

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 Aluminium Al
14 Silicon Si
15 Phosphorus P
16 Sulphur S
17 Chlorine Cl
18 Argon Ar
19 Potassium K
20 Calcium Ca
21 Scandium Sc
22 Titanium Ti
23 Vanadium V
24 Chromium Cr
25 Manganese Mn
26 Ferrous Fe
27 Cobalt Co
28 Nickel Ni
29 Copper Cu
30 Zinc Zn








Hope it helped and satisfied you!!
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Answer 2

Valence electron of atoms of atomic no. 21 to 30 belongs 4th energy level.
n = 4
l = 0