
Concept explainers
Key Skills Problems
What is the noble gas core for Mo?

Interpretation:
The noble gas core for
Concept introduction:
The number of protons present in the nucleusof an atom is equal to its atomic number.
The number of electrons in aneutral atom of an element is equal to its atomic number. With the help of thenumber of electrons, the electronic configuration of a given element can be deduced.
General rules for writing electronic configuration
Electrons will reside in the available orbitals of lowest possible energy.
Each orbital can accommodate a maximum of two electrons.
Electrons will not pair in degenerate orbitals if an empty orbital is available.
Orbitals will fill in order of increasing energy
s-orbital can have 0–2 electrons.
p-orbital can have 0–6 electrons.
d-orbital can have 0–10 electrons.
f-orbital can have 0–14 electrons.
In the electronic configuration, the symbol of the noble gas in brackets represents the core electrons.
Answer to Problem 1KSP
Correct Answer: Option (b).
Explanation of Solution
Reasons for the correct option:
The atomic number of
Hence, the electronic configuration of
The inert gas that precedes molybdenum is krypton. So, the electron configuration for the core electrons is
Hence the electronic configuration of
Hence, Option (b) is correct.
Reasons for the incorrect option:
Option (a) is incorrect because the total number of electrons in
Option (c) is incorrect because the total number of electrons in
Option (d) is incorrect because the total number of electrons in
Option (e) is incorrect because the total number of electrons in
Hence, options (a), (c), (d), and(e) are incorrect.
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