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To which block does an element with the electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$ belong in the periodic table?

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The number of unpaired electrons in a ferrous ion $(Fe^{2+})$ is:

Which quantum number provides information about the shape of an orbital?

Which electronic configuration represents a noble gas?

Describe the orbitals with the following quantum numbers using $s, p, d, f$ notations:
$(a) \ n = 2, l = 1$
$(b) \ n = 4, l = 0$
$(c) \ n = 5, l = 3$
$(d) \ n = 3, l = 2$

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