
Limiting compositions of f-block hydrides are
A. \[M{H_2}\mid andM{H_3}\mid \]
B. \[M{H_3}\mid andM{H_5}\mid \]
C. \[M{H_2}\mid andM{H_8}\mid \]
D. \[M{H_2}andM{H_6}\mid \]
Answer
164.7k+ views
Hint: Before we proceed into the problem, it is important to know the definition of f-block elements. The last electron of an F block element enters the anti-penultimate shell, which is inner to the penultimate shell where the last electron of a d-block element enters. Lanthanides are referred to as f-block elements because the final electron is filled into the orbital. "n-2" fills the f orbitals of the electron shell. The f orbitals can only hold a maximum of fourteen electrons.
Complete Step by Step Answer:
There is room for fourteen f-block elements in periods starting with the sixth. Although these components are typically not categorised, group 3 is where some authors place them.
We are asked to determine the limiting composition of -block hydrides.
With exception of d block elements (transition elements), f block elements create hydrides with fixed \[M{H_2}\] or \[M{H_3}\] compositions.
However, d block elements will create non-stoichiometric hydrides in the absence of a specified composition.
The composition of hydrides varies with temperature and pressure, among other factors.
But both d block element hydrides and f-block elements hydrides are intermittent hydrides.
The hydrogen will be wrapped between the metal atom gaps.
Therefore, limiting compositions of f-block hydrides are \[M{H_2}\mid andM{H_3}\mid \]
Hence, the option A is correct
Note: The inner layer present in the periodic table is occupied with the d block elements. The inner d orbits of groups \[3-13\] are gradually filled. On the flip side, the f block elements are found beyond and at the bottom of the periodic table. So, one should be thorough with periodic tables in order to answer these types of questions.
Complete Step by Step Answer:
There is room for fourteen f-block elements in periods starting with the sixth. Although these components are typically not categorised, group 3 is where some authors place them.
We are asked to determine the limiting composition of -block hydrides.
With exception of d block elements (transition elements), f block elements create hydrides with fixed \[M{H_2}\] or \[M{H_3}\] compositions.
However, d block elements will create non-stoichiometric hydrides in the absence of a specified composition.
The composition of hydrides varies with temperature and pressure, among other factors.
But both d block element hydrides and f-block elements hydrides are intermittent hydrides.
The hydrogen will be wrapped between the metal atom gaps.
Therefore, limiting compositions of f-block hydrides are \[M{H_2}\mid andM{H_3}\mid \]
Hence, the option A is correct
Note: The inner layer present in the periodic table is occupied with the d block elements. The inner d orbits of groups \[3-13\] are gradually filled. On the flip side, the f block elements are found beyond and at the bottom of the periodic table. So, one should be thorough with periodic tables in order to answer these types of questions.
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