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Yttrium (Y) has an atomic number of 39, which means it has 39 electrons. Its electron configuration is [Kr] 5s² 4d¹, indicating that there is one 4d electron in yttrium. Therefore, the number of 4d electrons in Y is 1.
Molybdenum (Mo) has a configuration of [Kr] 5s^1 4d^5. Therefore, it has 5 4d electrons.
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Yes Zr (atomic number 40) is the first transitional element in period 5 ('4d-block' metals).
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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.
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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.
8 - 4d = 12-4d = 4d = -1
d = 2
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The element with 3 valence electrons in the 4d sublevel is Yttrium (Y). It is located in group 3 of the periodic table and has an atomic number of 39. In its electron configuration, Yttrium has the outer configuration of [Kr] 4d¹ 5s², contributing three valence electrons from the 4d and 5s orbitals.