- The electronic configuration of elements refers to the arrangement of electrons in the energy levels (or shells) surrounding the nucleus of an atom.
- The number of electrons in each shell is determined by the element's atomic number, which is equal to the number of protons in the nucleus.
- The first 20 elements have a simple electron configuration, which can be easily predicted using the Aufbau principle.
Electronic Configuration upto 30 Elements
- Hydrogen (1 electron) - 1s1
- Helium (2 electrons) - 1s2
- Lithium (3 electrons) - 1s2 2s1
- Beryllium (4 electrons) - 1s2 2s2
- Boron (5 electrons) - 1s2 2s2 2p1
- Carbon (6 electrons) - 1s2 2s2 2p2
- Nitrogen (7 electrons) - 1s2 2s2 2p3
- Oxygen (8 electrons) - 1s2 2s2 2p4
- Fluorine (9 electrons) - 1s2 2s2 2p5
- Neon (10 electrons) - 1s2 2s2 2p6
- Sodium (11 electrons) - 1s2 2s2 2p6 3s1
- Magnesium (12 electrons) - 1s2 2s2 2p6 3s2
- Aluminum (13 electrons) - 1s2 2s2 2p6 3s2 3p1
- Silicon (14 electrons) - 1s2 2s2 2p6 3s2 3p2
- Phosphorus (15 electrons) - 1s2 2s2 2p6 3s2 3p3
- Sulfur (16 electrons) - 1s2 2s2 2p6 3s2 3p4
- Chlorine (17 electrons) - 1s2 2s2 2p6 3s2 3p5
- Argon (18 electrons) - 1s2 2s2 2p6 3s2 3p6
- Potassium (19 electrons) - 1s2 2s2 2p6 3s2 3p6 4s1
- Calcium (20 electrons) - 1s2 2s2 2p6 3s2 3p6 4s2
The electron configuration for elements beyond atomic number 20 becomes more complex and is determined by the filling of the 3d and 4s subshells. Some of the elements and their electron configurations up to atomic number 30 are:
- Scandium (21 electrons) - [Ar] 3d1 4s2
- Titanium (22 electrons) - [Ar] 3d2 4s2
- Vanadium (23 electrons) - [Ar] 3d3 4s2
- Chromium (24 electrons) - [Ar] 3d5 4s1
- Manganese (25 electrons) - [Ar] 3d5 4s2
- Iron (26 electrons) - [Ar] 3d6 4s2
- Cobalt (27 electrons) - [Ar] 3d7 4s2
- Nickel (28 electrons) - [Ar] 3d8 4s2
- Copper (29 electrons) - [Ar] 3d10 4s1
- Zinc (30 electrons) - [Ar] 3d10 4s2
It is important to note that these electron configurations are only approximate and do not take into account the interactions between electrons, such as spin and electron.