Electronic Structure of Matter

How many orbitals are on the third principal energy level?

• 2

• 9

• 3

• 10

Which of the following postulates explain that no two electrons can have the same set of four quantum numbers?

• Hund’s Rule

• Aufbau principle

• Dalton’s Atomic Theory

• Pauli’s Exclusion Principle

Based on Rutherford’s atomic model, which sub-atomic particle is present in the nucleus of an atom?

• Proton only

• Proton and Neutron

• Neutron and Electron

• Proton and Electron

Who proposed the probability that electrons can be found in certain locations around the nucleus of an atom?

• Niel’s Bohr

• Ernest Rutherford

• Erwin Schrodinger

• Joseph John Thomson

Which among the following shows that an atom is stable?

• With 6 valence electrons

• With 8 valence electrons

• With 10 valence electrons

• With 12 valence electrons

Which explains the filling up of the orbital in the order of increasing energy?

• Pauli’s Exclusion

• Aufbau Principle

• Octet Rule

• Hund’s Rule

An element will always have the same number of ________.

• electrons

• neutrons

• protons

• orbitals

Which orbital designation has the highest energy?

• 2s

• 3d

• 2p

• 4s

Which atomic model is proposed by Schrodinger?

• nuclear model

• raisin bread model

• planetary model

• quantum mechanical model

The symbol "n" in the Bohr theory of atomic structure refers to

• the energy of electron

• the number of electron in an energy level

• the orbit in which an electron is found

• the total energy of the atom