Ru Ā²āŗ :[Kr] 4dā¶
W Ā³āŗ : [Xe] 4fĀ¹ā“5dĀ³
Further explanation
The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.
This energy level is expressed in the form of electron configurations.
Charging electrons in the sub shell use the following sequence:
1sĀ², 2sĀ², 2pā¶, 3sĀ², 3pā¶, 4sĀ², 3dĀ¹ā°, 4pā¶, 5sĀ², 4dĀ¹ā°, 5pā¶, 6sĀ², etc.
Writing the electron configuration can be abbreviated using the electron configuration of the noble gas in brackets because it has the same configuration
a. Ru element-Ruthenium
It is in group 8B and period 5 with atomic number 44
So the electron configuration:
1sĀ², 2sĀ², 2pā¶, 3sĀ², 3pā¶, 4sĀ², 3dĀ¹ā°, 4pā¶, 5sĀ¹, 4dā·
This configuration includes an exception to the Aufbau rule which is that Electrons occupy orbitals of the lowest energy level, which should be 5sĀ² 4dā¶ (exceptions occur mainly in the transition group), so that with the configuration of the noble gases from Kr [1sĀ², 2sĀ², 2pā¶, 3sĀ², 3pā¶, 4sĀ², 3dĀ¹ā°, 4pā¶], the Ru element can be written:
Ruthenium-Ru: [Cr] 5sĀ¹4dā·
Because it releases 2 electrons to form RuĀ²āŗ ions, the configuration becomes
Ru Ā²āŗ :[Kr] 4dā¶
W element - Wolfram / Tungsten
It is in group 6B and period 6 with atomic number 74
So the electron configuration:
1sĀ², 2sĀ², 2pā¶, 3sĀ², 3pā¶, 4sĀ², 3dĀ¹ā°, 4pā¶, 5sĀ², 4dĀ¹ā°, 5pā¶, 6sĀ²4fĀ¹ā“5dā“
Because according to Xe configuration [1sĀ², 2sĀ², 2pā¶, 3sĀ², 3pā¶, 4sĀ², 3dĀ¹ā°, 4pā¶, 5sĀ², 4dĀ¹ā°, 5pā¶] it can be written:
W: [Xe] 6sĀ²4fĀ¹ā“5dā“
Because it releases 3 electrons to form a WĀ³āŗ ion, the configuration becomes (electrons with the largest n , 6s and 5d, the electrons are removed first):
W Ā³āŗ : [Xe] 4fĀ¹ā“5dĀ³
Learn more Ā
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