Elements 1 - 30 with Atomic
Number and Symbol
Atomic Number
Symbol
Element Name
1
H
Hydrogen
2
He
Helium
3
Li
Lithium
4
Be
Beryllium
5
B
Boron
6
C
Carbon
7
N
Nitrogen
8
O
Oxygen
9
F
Fluorine
10
Ne
Neon
11
Na
Sodium
12
Mg
Magnesium
13
Al
Aluminum
14
Si
Silicon
15
P
Phosphorus
16
S
Sulfur
17
Cl
Chlorine
18
Ar
Argon
19
K
Potassium
20
Ca
Calcium
21
Sc
Scandium
22
Ti
Titanium
23
V
Vanadium
24
Cr
Chromium
25
Mn
Manganese
26
Fe
Iron
27
Co
Cobalt
28
Ni
Nickel
29
Cu
Copper
30
Zn
Zinc
The electron shells are often denoted by letters, and the first
four shells are named K, L, M, and N. These letters
correspond to the principal quantum numbers (n values)
associated with each shell:
K Shell (n=1): The innermost shell, closest to the nucleus. It
can hold a maximum of 2 electrons.
L Shell (n=2): The second shell, which is located further from
the nucleus than the K shell. It can hold a maximum of 8
electrons.
M Shell (n=3): The third shell, even farther from the nucleus. It
can hold a maximum of 18 electrons.
N Shell (n=4): The fourth shell, located beyond the first three.
It can hold a maximum of 32 electrons.
Element
Valency
H
1
He
0
Li
1
Be
2
B
3
C
4
N
3, 5
O
-2
F
-1
Ne
0
Na
1
Mg
2
Al
3
Si
4
P
3, 5
S
-2
Cl
-1
Ar
0
K
1
Ca
2
Sc
3
Ti
4
V
5
Cr
6
Mn
7
Fe
2, 3
Co
2
Ni
2
Cu
2
Zn
2