Exam 12: Quantum Mechanics and Atomic Theory

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Ar] 4s²3d⁷

In which groups do all the elements have the same number of valence electrons?

Which of the following combinations of quantum numbers do not represent permissible solutions of the Schrodinger equation for the electron in the hydrogen atom? (In other words, which combination of quantum numbers is not allowed?) (Combinations are listed as follows: n, l, m_(l), m_(s).)

From the following list of observations, choose the one that most clearly supports the conclusion that atoms contain electrons.

Which two elements are most likely to have the same oxidation state in an ionic compound?

what will be the kinetic energy of the ejected electrons? h = 6.626 x 10^-34J^.s, c = 2.998 x 10⁸ m/s

How many f orbitals have the value n = 3?

Which form of electromagnetic radiation has the shortest wavelengths?

Consider the following sets of quantum numbers. Which set(s) represent(s) impossible combinations?

Which statements about hydrogen are true? I. H has a lower ionization energy than He. II. H^- is smaller than H. III. H has a higher effective nuclear charge than He. IV. H is always a metal. V. H does not have a second ionization energy.

Place the elements As, S, and Ar in order of increasing atomic radius.

Researchers recently formed a new synthetic element with atomic number 109. Which of the following elements would have chemical properties most similar to this new element?

The statement that the first ionization energy for an oxygen atom is lower than the first ionization energy for a nitrogen atom is

An element has the electron configuration [Kr] 4d¹⁰5s²5p². The element is a(n)

Which of the following atoms has 3 electrons in p orbitals in its valence shell?

From the following list of observations, choose the one that most clearly supports the conclusion that electrons have wave properties.

What is the electron configuration of the element with atomic number 113?

What is the wavelength, in nanometers, of a photon of light whose frequency is 5.38 *10¹⁴ Hz?

Write the electron configuration for the following: -N

Which element has the greatest second ionization energy?