Grade-9 Reviewer

Which scientist is known for developing the wave equation that describes the probability of finding electrons in specific regions surrounding an atom's nucleus?

• Niels Bohr

• Ernest Rutherford

• Erwin Schrodinger

• Joseph John Thomson

What describes the probable location of electrons in atoms by detailing: Principal energy level, energy sublevel, orbital (in each sub-level), and spin?

• Quantum Cloud

• Quantum Number

• Quantum Orbital

• Quantum Mechanical Model

Electrons are found in specific regions around the nucleus called orbitals. Which of the following describes the arrangement of electrons in these orbitals surrounding the nucleus?

• energy level

• atomic number

• electron orbital

• electron configuration

Which of the following orbital designations possesses the highest energy level?

• 2p

• 2s

• 3d

• 4s

What is the correct sequence of the following atomic orbitals?

• s orbital, p orbital, d orbital, f orbital

• p orbital, d orbital, f orbital, s orbital

• f orbital, s orbital, p orbital, d orbital

• d orbital, f orbital, s orbital, p orbital

Identify the group and period of the element that has the electronic configuration of 1s² 2s² 2p⁶.

• Group 1A period 2

• Group 2A period 3

• Group 8A period 2

• Group 8A period 4

For the quantum numbers n = 3 and l = 2, which subshell can the electron be located in?

• 3d

• 3p

• 3s

• 2d

How does the Quantum Mechanical Model fundamentally differ from the Bohr Model in its description of electron locations?

• In the Bohr Model, electrons travel in fixed orbits, whereas in the Quantum Model, they exist in orbitals.

• The Bohr Model depicts electrons in fixed paths, while the Quantum Model represents them in probabilistic regions.

• While the Bohr Model restricts electron motion, the Quantum Model permits movement in all directions.

• The Bohr Model specifies exact electron paths, whereas the Quantum Model provides probabilities of finding electrons.

Evaluate the validity of the following quantum number set assigned to an electron: n = 3, l = 0, ml = 1, ms = +½.

• Invalid, because l cannot equal n.

• Valid, because spin can be either +½ or –½.

• Invalid, because ml cannot be one when l = 0.

• Valid, because all quantum numbers are within allowed values.

Which of the following is a characteristic feature of covalent compounds?

• Composed of ions

• Exhibit poor electrical conductivity

• Conduct electricity when dissolved in water

• Have high melting and boiling points