Structure of Atom - Class 11 Chemistry - Chapter 2 - Notes, NCERT Solutions & Extra Questions
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Extra Questions - Structure of Atom | NCERT | Chemistry | Class 11
___________ are the elements or ions having the same number of electrons.
A) Isotopes
B) Isobars
C) Isotones
D) Isoelectronic species
The correct option is D) Isoelectronic species.
Isoelectronic species refer to atoms, molecules, or ions that contain the same number of electrons. This is the defining characteristic of isoelectronic species. For instance, consider the following examples:
$\mathrm{N}^{3-}$
$\mathrm{Ne}$
$\mathrm{Al}^{3+}$
Each of these has 10 electrons, which can be detailed as:
$\mathrm{N}^{3-}$ has 7 protons and gains 3 extra electrons (totaling 10).
$\mathrm{Ne}$ is a neutral atom with 10 protons and 10 electrons.
$\mathrm{Al}^{3+}$ has 13 protons and loses 3 electrons (leaving it with 10).
Despite these species having a different number of protons, their electron count is the same. Thus, they are isoelectronic.
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To separate an electron from a hydrogen-like atom in an excited state, an energy of $3.4 \mathrm{eV}$ is required. If the radius of the first orbit of a $\mathrm{H}$-atom is $0.53 \AA$, then the de Broglie wavelength associated with the electron (in $\AA$) is:
A $ 3.33$
B $ 6.66$
C $ 13.31$
D None of these
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