![]() Now I’ll show you the complete list of elements with electrons per shell. of electrons this orbit can hold K shell, n = 1 2 × 1² = 2 L shell, n = 2 2 × 2² = 8 M shell, n = 3 2 × 3² = 18 N shell, n = 4 2 × 4² = 32 Here is a table showing electrons in each shell. Point to Remember: Mostly for transition and inner transition elements, the valence electrons are the electrons present in the shells outside the noble gas core.How many electrons can be accommodated in each shell? Thus the inner transition elements have valence electrons ranging from 3 to 16 (See above image of periodic table). So the electrons present in the f-orbitals as well as s-orbitals act like valence electrons. The inner transition elements have incomplete f-orbitals and the f-orbitals are very close to outer s-orbitals. The inner transition elements also have a similar case. Thus the transition elements have valence electrons ranging from 3 to 12 (See above image of periodic table). So the electrons present in the d-orbitals as well as s-orbitals act like valence electrons. The transition elements have incomplete d-orbitals and the d-orbitals are very close to the outer s-orbitals. It seems a little difficult to find the valence electrons of transition elements and inner transition elements. Valence electrons of Transition and Inner transition elements Now, this method does not suit for transition and inner transition elements. And the number of electrons present in this principal quantum number is 2. In this electron configuration, you can see that the highest principal quantum number is 3. The electron configuration of magnesium is 1s 2 2s 2 2p 6 3s 2. Let’s consider the example of magnesium only. ![]() In the electron configuration, you have to see the total number of electrons present in the shell with a highest principal quantum number. You can also find the valence electrons by using the electron configuration of elements. So the valence electrons of magnesium are 2. ![]() You can see that the magnesium atom has 2 electrons in its outermost orbit. ![]()
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