Electronic Structure of Matter Quiz

Who formulated the “Uncertainty Principle”?

• Erwin Schrodinger

• James Maxwell

• Louise de Broglie

• Werner Heisenberg

Answer explanation

The “Uncertainty Principle” was formulated by Werner Heisenberg. It states that certain pairs of physical properties, like position and momentum, cannot both be precisely known at the same time, highlighting fundamental limits in measurement.

Where are the electrons usually found according to the atomic theory?

• In the atomic nucleus.

• Outside the nucleus, most of an atoms’ volume is the electron cloud.

• Outside the nucleus, yet near it because they are attracted to protons.

• Anywhere they want to be – no particular location is more likely than any other.

Answer explanation

According to atomic theory, electrons are found outside the nucleus, forming an electron cloud that occupies most of an atom's volume. This choice accurately reflects the distribution of electrons in an atom.

What is the region around the atomic nucleus where the electron is mostly found?

• Frequency

• Energy Level

• Atomic Orbital

• Atomic Emission Spectrum

Answer explanation

The region around the atomic nucleus where an electron is most likely to be found is called the atomic orbital. This term describes the probability distribution of an electron's position, unlike energy levels or other options.

Which shows the correct order in the following atomic orbitals?

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

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

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

• s orbital, p orbital, d orbital f orbital

Answer explanation

The correct order of atomic orbitals is based on increasing energy levels: s < p < d < f. Therefore, the correct choice is 's orbital, p orbital, d orbital, f orbital'.

Which of the following is the lowest value of that the principal quantum number may have?

• 0

• 1

• 2

• 3

Answer explanation

The principal quantum number (n) represents the energy level of an electron in an atom. It can only take positive integer values, starting from 1. Therefore, the lowest value it can have is 1, making it the correct answer.

How many electrons could be held in the second shell of an atom if the spin quantum number m_s could have three values instead of just two? (Hint: Consider the Pauli exclusion principle)

• 12

• 15

• 20

• 24

Answer explanation

The second shell can hold 8 electrons (2s and 6p). If m_s has 3 values, each orbital can hold 3 electrons. Thus, 2s (2) + 3p (6) = 12 electrons total, adhering to the Pauli exclusion principle.

What is the group and period of an element with an electronic configuration of 1s2 2s2 2p6?

• Group 2 period 3

• Group 4 period 2

• Group 8 period 2

• Group 8 period 4

Answer explanation

The electronic configuration 1s2 2s2 2p6 corresponds to the element Neon (Ne), which is in Group 8 (noble gases) and Period 2 of the periodic table.

Which orbital designation has the highest energy?

• 2s

• 2p

• 3d

• 4s

Answer explanation

The 3d orbital has higher energy than 2s, 2p, and 4s due to its principal quantum number and angular momentum. In general, d orbitals are higher in energy than s and p orbitals in the same principal energy level.

What occurs when an electron moves from high-energy level to a low one?

• The atom moves faster

• Colored light is given off

• This process is not possible

• Another electron goes from a low energy level to a high one.

Answer explanation

When an electron transitions from a high-energy level to a low one, it releases energy in the form of colored light. This phenomenon is a key principle in atomic physics and explains the emission spectra of elements.

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

• Octet Rule

• Hund’s Rule

• Pauli’s Exclusion

• Aufbau Principle

Answer explanation

The Aufbau Principle states that electrons fill orbitals starting from the lowest energy level to the highest. This principle explains the order of orbital filling, making it the correct choice for this question.