Quantum Mechanical Model and Electron Configuration

Who proposed the idea of atomos?

• John Dalton

• J.J. Thompson

• Ernest Rutherford

• Democritus

Which of the following is NOT a key point of Dalton's atomic theory?

• All elements are made up of tiny particles called atoms.

• Atoms of a particular element are identical.

• Atoms are indivisible and cannot be created nor destroyed.

• Atoms of different elements can combine to form molecules.

What is the name of the model of the atom that J.J. Thompson formulated?

• Plum Pudding Model

• Nuclear Model

• Bohr Model

• Quantum Mechanical Model

What does the Uncertainty Principle state?

• It is impossible to know precisely both the velocity and position of a particle at the same time.

• It is impossible to create or destroy matter.

• The energy of an electron can only be quantized.

• The nucleus of an atom is made up of protons and neutrons.

What are the three things we need to know in order to predict the probable location of an electron in an atom?

• Nucleus, electrons, protons

• Atomic number, mass number, isotope

• Energy level, sublevel, orbital

• Element, compound, mixture

What is the Aufbau Principle?

• Each orbital must receive one electron before any orbital can receive a second filling of electron.

• Electrons can only occupy orbitals with a maximum of two electrons.

• The total number of electrons in an atom is equal to the atomic number.

• Electrons fill orbitals with increasing energy levels before filling orbitals with lower energy levels.

What is Pauli's Exclusion Principle?

• Electrons fill orbitals with increasing energy levels before filling orbitals with lower energy levels.

• Electrons can only occupy orbitals with a maximum of two electrons.

• The total number of electrons in an atom is equal to the atomic number.

• Each orbital must receive one electron before any orbital can receive a second filling of electron.

Which of the following elements has the electron configuration 1s²2s²2p⁶3s²3p⁶?

• Sodium (Na)

• Magnesium (Mg)

• Argon (Ar)

• Silicon (Si)

Which of the following elements has the electron configuration 1s²2s²2p⁶3s²3p⁶4s²?

• Potassium (K)

• Silicon (Si)

• Aluminum (Al)

• Magnesium (Mg)

Which of the following elements has the electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶?

• Copper (Cu)

• Krypton (Kr)

• Gallium (Ga)

• Germanium (Ge)