The Question is from neet-chemistry classification-of-elements-and-periodicity-in-prop spdf-block, and it was created by the author P SRAVAN KUMAR

Question

Which of the following statements about the actinide series is INCORRECT?

P SRAVAN KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Periodic Trends and Properties of Actinides
	**Related Topics**: Electron Configuration, Oxidation States, Radioactivity, Inner Transition Metals
	**Prerequisites**: Basic understanding of the periodic table, electron orbitals, and radioactivity.
## SOLUTION PATHWAY
**Given Information**:
	Statements about the actinide series.
**Method & Steps**:
	1. Analyze each statement based on the properties of actinides.
	2. Identify the incorrect statement.
 ## OPTION ANALYSIS
[A] ✓: All actinides are radioactive. 
Reasoning: This is a true statement.  All known isotopes of actinides are radioactive due to their large, unstable nuclei.
[B] :x: +3 is the only common oxidation state for actinides. 
Reasoning: This is the *incorrect* statement. While +3 is a common oxidation state for actinides, especially the later actinides (like americium and beyond),  the earlier actinides (like uranium, neptunium, and plutonium) exhibit a variety of oxidation states, including +3, +4, +5, +6, and even +7 in some cases. The range of oxidation states stems from the relatively small energy differences between the 5f, 6d, and 7s orbitals.
[C] ✓: They are inner transition metals.
Reasoning: This is a true statement. The actinides, along with the lanthanides, are classified as inner transition metals. They are found in the f-block of the periodic table and are characterized by the filling of f orbitals.
[D] ✓: The actinide series is characterized by the filling of the 5f orbitals.
Reasoning: This is a true statement.  The actinide series consists of 15 elements from actinium (Ac, atomic number 89) to lawrencium (Lr, atomic number 103).  Across this series, the 5f orbitals are progressively filled.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Oversimplifying oxidation states:  Students may mistakenly believe that only one oxidation state is dominant for a series of elements.  Remember that especially for the transition metals and inner transition metals, multiple oxidation states are common.
		2. Confusing lanthanides and actinides: Both are inner transition metals, but they have different properties. Pay attention to the specific characteristics of each series.
	**Quick Tips**:
		1. Remember that radioactivity is a characteristic of all actinides.
		2. The variable oxidation states of early actinides are important in their chemistry and applications.

P SRAVAN KUMAR · Answer

All actinides are radioactive.

P SRAVAN KUMAR · Answer

The correct Option is "+3 is the only common oxidation state for actinides."

P SRAVAN KUMAR · Answer

They are inner transition metals.

P SRAVAN KUMAR · Answer

The actinide series is characterized by the filling of the 5f orbitals.

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