The elements that fill the 3d orbital before the 4s orbital are transition metals. They are found in the fourth period (row) of the Periodic Table, starting from Scandium (Sc, atomic number 21) to Zinc (Zn, atomic number 30).

Here's the step-by-step process:

1. The 3d orbital starts filling up after the 4s orbital is filled. This is because the 3d orbital has a slightly higher energy level than the 4s orbital.

2. The first element to fill the 3d orbital is Scandium. It has an electron configuration of [Ar] 3d1 4s2.

3. After Scandium, the 3d orbital continues to fill up across the period from Titanium (Ti) to Zinc (Zn).

4. By the time we reach Zinc, the 3d orbital is completely filled with 10 electrons, and the electron configuration of Zinc is [Ar] 3d10 4s2.

So, the elements that fill the 3d orbital before the 4s orbital are Scandium (Sc) to Zinc (Zn).

Question

The elements that fill the 3d orbital before the 4s orbital are transition metals. They are found in the fourth period (row) of the Periodic Table, starting from Scandium (Sc, atomic number 21) to Zinc (Zn, atomic number 30).

Here's the step-by-step process:

1. The 3d orbital starts filling up after the 4s orbital is filled. This is because the 3d orbital has a slightly higher energy level than the 4s orbital.

2. The first element to fill the 3d orbital is Scandium. It has an electron configuration of [Ar] 3d1 4s2.

3. After Scandium, the 3d orbital continues to fill up across the period from Titanium (Ti) to Zinc (Zn).

4. By the time we reach Zinc, the 3d orbital is completely filled with 10 electrons, and the electron configuration of Zinc is [Ar] 3d10 4s2.

So, the elements that fill the 3d orbital before the 4s orbital are Scandium (Sc) to Zinc (Zn).

Knowee AI · Accepted Answer

The elements that fill the 3d orbital before the 4s orbital are transition metals. They are found in the fourth period (row) of the Periodic Table, starting from Scandium (Sc, atomic number 21) to Zinc (Zn, atomic number 30).

Here's the step-by-step process:

1. The 3d orbital starts filling up after the 4s orbital is filled. This is because the 3d orbital has a slightly higher energy level than the 4s orbital.

2. The first element to fill the 3d orbital is Scandium. It has an electron configuration of [Ar] 3d1 4s2.

3. After Scandium, the 3d orbital continues to fill up across the period from Titanium (Ti) to Zinc (Zn).

4. By the time we reach Zinc, the 3d orbital is completely filled with 10 electrons, and the electron configuration of Zinc is [Ar] 3d10 4s2.

So, the elements that fill the 3d orbital before the 4s orbital are Scandium (Sc) to Zinc (Zn).

which elements fill 3d before 4s

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