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Molybdenum (Mo) has a configuration of [Kr] 5s^1 4d^5. Therefore, it has 5 4d electrons.
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journey to the centre of the earth
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Yes Zr (atomic number 40) is the first transitional element in period 5 ('4d-block' metals).
The element with three 4d electrons is ruthenium (Ru), which has an atomic number of 44. The 4d sublevel can hold a maximum of 10 electrons, so with only three electrons, ruthenium has a partially filled 4d orbital.
8 - 4d = 12-4d = 4d = -1
The symbol of the first element to have an electron in the 4d sublevel in its ground state is Yttrium, symbolized as Y, with the electron configuration [Kr] 4d^1 5s^2.
4d is time...any moving object is 4d
d = 2
there is no 4d known to man
2-4d = -2