Total no. Of orbitals that can be filled in 7th period according to n+l rule 1.32 2. 16 3.9 4. 25

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Electrons in an orbital are filled according to which rule?

Q. Assertion :The outer electronic configurations of Cr and Cu are

3 d^{5} 4 s^{1}

and

3 d^{10} 4 s^{1}

respectively. Reason: Electrons are filled in orbitals in order of their increasing energies given by (n+l) rule.

Q. Assertion :The

5^{t h}

period of periodic table contains 18 elements not 32. Reason:

n = 5, l = 0, 1, 2, 3

. The order in which the energy of available orbitals

4 d, 5 s

and

5 p

increases in

5 s < 4 d < 5 p

and the total number of orbitals available are 9 and thus 18 electrons can be accommodated.

Q. According to VBT any covalent bond will be formed by overlapping of valence atomic orbitals of bonded atoms provided atomic orbitals must be half–filled and electrons be in opposite spin.
According to type of overlapping covalent bonds can be classified as: (a)

σ

bond (b)

π

bond (c)

δ

bond.
The combination of orbital that cannot produce non–bonding molecular orbital is:
(internuclear axis is z–axis)

Q. It can be readily seen that the number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled. Explain this statement with examples

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