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What is the atomic number of the element with $M^{2+}$ ion having electronic configuration $[Ar] 3d^8$?

What are the electronic configurations of elements with atomic numbers $Z = 117$ and $Z = 120$?

Two electrons $A$ and $B$ in an atom have the following set of quantum numbers:
$A: n=3, l=2, m_l=-2, m_s=+1/2$
$B: n=3, l=0, m_l=0, m_s=+1/2$
What is true for $A$ and $B$?

The atomic weight of an element is double its atomic number. If there are four electrons in the $2p$ orbital,the element is:

Number of completely filled orbitals in xenon atom $(Xe)$ is

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