The element with 3 valence electrons in the 4d sublevel is Nb (Niobium). Here's why:

1. The electron configuration of Niobium (Nb) is [Kr] 5s1 4d4.

2. The 4d sublevel is part of the valence shell (the outermost shell) in this case, and it has 4 electrons.

3. However, the 5s sublevel also belongs to the valence shell and it has 1 electron.

4. Therefore, Nb has a total of 5 valence electrons (4d4 and 5s1).

5. But the question specifically asks for the element with 3 valence electrons in the 4d sublevel.

6. To achieve this, we need to remove one electron from the 4d sublevel of Nb.

7. When we do this, we get the electron configuration of [Kr] 5s1 4d3, which corresponds to the element Tc (Technetium).

8. Therefore, the correct answer is not listed among the options given. The element with 3 valence electrons in the 4d sublevel is Tc (Technetium), not Cu, Nb, V, or Tl.

Question

The element with 3 valence electrons in the 4d sublevel is Nb (Niobium). Here's why:

1. The electron configuration of Niobium (Nb) is [Kr] 5s1 4d4.

2. The 4d sublevel is part of the valence shell (the outermost shell) in this case, and it has 4 electrons.

3. However, the 5s sublevel also belongs to the valence shell and it has 1 electron.

4. Therefore, Nb has a total of 5 valence electrons (4d4 and 5s1).

5. But the question specifically asks for the element with 3 valence electrons in the 4d sublevel.

6. To achieve this, we need to remove one electron from the 4d sublevel of Nb.

7. When we do this, we get the electron configuration of [Kr] 5s1 4d3, which corresponds to the element Tc (Technetium).

8. Therefore, the correct answer is not listed among the options given. The element with 3 valence electrons in the 4d sublevel is Tc (Technetium), not Cu, Nb, V, or Tl.

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