Atomic Structure

The electronic configuration of atomic number 20 of an atom is which of the following?

• 2, 6, 6, 6

• 2, 8, 8, 2

• 2, 8, 10

• 2,4,5,8

 Total number of orbitals associated with third shell will be __________.

• 2

• 4

• 9

• 3

The electronic configuration for oxygen is written as 1s2 2s2 2p4. Which rule will this configuration be violating?

• Aufbau’s principle

• Hund’s rule

• Pauli’s exclusion principle

• None of the above

Carbon monoxide has ten bonding electrons and four antibonding electrons. Therefore it has a bond order of

• 3

• 7

• 1

• 2

Antibonding molecular orbitals are produced by

• constructive interaction of atomic orbitals.

• destructive interaction of atomic orbitals.

• the overlap of the atomic orbitals of two negative ions

• all of these

A triple bond contains ___ sigma bond(s) and ___ pi bond(s).

• 0, 3

• 3, 0

• 1, 2

• 3, 2

ψ_MO = ψ_A + ψ_B.

• True

• False

Which of the following is a condition for the combination of atomic orbitals?

• Combining atomic orbitals need not have equal energy

• Combining atomic orbitals must have symmetry as per molecular axis

• Combining atomic orbitals must overlap to a minimum extent

• For combining atomic orbitals, X-axis should be taken as a molecular axis

Which Quantum Number is used to describe Sub shell????

• n

• l

• m

• s

According to LCAO theory the destructive approach of atomic orbital wave equation could result in

• bonding orbitals

• Anti-bonding orbitals

• Non-bonding