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Lanthanides are...

Lanthanides are

A

14 elements in the sixth period (At.no=90 to 103) that are filling 4f sub-level

B

14 elements in the seventh period (At.no.=90 to 103) that are filling 5f sub-level

C

14 elements in the sixth period (At.no.=58 to 71) that are filling 4f sub-level).

D

14 elements in the seventh period (At. No.=58 to 71) that are filling 4f sub-level

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Range of Lanthanides:** - The lanthanides are a series of 14 elements that start from atomic number 58 (Cerium) and go up to atomic number 71 (Lutetium). - This can be represented as: - Lanthanum (La, 57), Cerium (Ce, 58), Praseodymium (Pr, 59), Neodymium (Nd, 60), Promethium (Pm, 61), Samarium (Sm, 62), Europium (Eu, 63), Gadolinium (Gd, 64), Terbium (Tb, 65), Dysprosium (Dy, 66), Holmium (Ho, 67), Erbium (Er, 68), Thulium (Tm, 69), Ytterbium (Yb, 70), Lutetium (Lu, 71). 2. **Determine Their Position in the Periodic Table:** - Lanthanides are located in the sixth period of the periodic table. - They are placed in the f-block, specifically filling the 4f subshell. 3. **Understand Their Electron Configuration:** - The lanthanides involve the filling of the 4f subshell, which is characteristic of these elements. - They have similar properties due to the presence of the same number of electrons in their outermost and penultimate shells. 4. **Identify the Correct Option:** - Given the options, the correct statement about lanthanides is that they are the 14 elements in the 6th period with atomic numbers from 58 to 71, filling the 4f sub-level. - Therefore, the correct answer is option 3. **Final Answer:** - Lanthanides are the 14 elements in the 6th period (atomic numbers 58 to 71) that fill the 4f subshell. ---
**Step-by-Step Solution:** 1. **Identify the Range of Lanthanides:** - The lanthanides are a series of 14 elements that start from atomic number 58 (Cerium) and go up to atomic number 71 (Lutetium). - This can be represented as: - Lanthanum (La, 57), Cerium (Ce, 58), Praseodymium (Pr, 59), Neodymium (Nd, 60), Promethium (Pm, 61), Samarium (Sm, 62), Europium (Eu, 63), Gadolinium (Gd, 64), Terbium (Tb, 65), Dysprosium (Dy, 66), Holmium (Ho, 67), Erbium (Er, 68), Thulium (Tm, 69), Ytterbium (Yb, 70), Lutetium (Lu, 71). 2. **Determine Their Position in the Periodic Table:** ...
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