Electronic configuration of cromium is
Cr-[Ar]4s¹3d⁵
When cromium loses two electrons it becomes Cr⁺².
So its electronic configuration becomes,
Cr⁺²-[Ar]3d⁴
One electron will go from 4s orbital and one electron will go from 3d orbital.
So the answer here is D. [Ar]3d⁴ -because after losing 2 electrons electronic configuration of cromium becomes [Ar] 3d⁴.
The answer is Electron
Hope this helped!!! :)
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Answer:</h2>
Beryllium ion.
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Explanation:</h2>
- Adding one proton to an atom of lithium which have 3 protons, 4 neutrons and 3 electrons will form a beryllium ion.
- The new atom formed after adding a proton will have 4 protons and 4 neutrons since to have a mass number of 9 then it has to form an ion.
- Beryllium is of gray colour, strong, light-weight, and used as hardening agent in different alloys. It has one of the highest m.p(melting point) in the light metals.
Result: On adding a proton in lithium will form a beryllium ion.
This happens because the molecules in solids maintain a regular pattern and only vibrate or moves slowly. Hope this helps!
