Chemistry Homework #6
In which direction on the periodic table does metallic character increase?
Down and to the left.
All of the following pairs of ions are isoelectronic except which one? A) Al³⁺ and N³⁻ B) Fe²⁺ and Co³⁺ C) Fe²⁺ and Mn³⁺ D) K+ and Ca²⁺ E) Zn²⁺ and Cu+
Fe²⁺ and Mn³⁺ Isoelectronic species are elements/ions with the same electron configuration (and therefore the same number of electrons).
Which of the following states that no two electrons can have the same set of four quantum numbers?
Pauli exclusion principle
Which type of electromagnetic radiation has the largest wavelength?
Radio waves
Light wave A has a greater frequency than light wave B. Which has a greater wavelength?
Wave B
Which of the following sets of quantum numbers can describe a 3p electron?
n = 3, ℓ = 1, mℓ = 1
The ground state electron configuration of an Al atom is
1s²2s²2p⁶3s²3p¹
Which of the following orbitals cannot exist?
3f
For which atomic orbital does n = 3 and ℓ = 1?
3p
If light has a lot of energy, it will have:
A small wavelength
Which color (frequency) of light travels the fastest in a vacuum?
All have the same speed
Which of the following pairs of ions represent isoelectronic species?
Al³⁺ and O²⁻ Isoelectronic species are elements/ions with the same electron configuration (and therefore the same number of electrons). Of the options given, the species Al³⁺ and O²⁻ both have the electron configuration of Ne (1s²2s²2p⁶), meaning they are isoelectronic.
What scientist proposed that the electron in a hydrogen atom can only have certain energies (i.e., the electron is quantized)? A) Planck B) Bohr C) Rutherford D) Rydberg E) de Broglie
Bohr
Which of the following radii comparisons is incorrect?
Br⁻ < Br Cations are always smaller than the neutral atom from which it is derived. Anions are always larger than the neutral atom from which it is derived.
Einstein's work on the photoelectric effect validated and made extensive use of which of the following equations?
E = hν
What element is theoretically the largest of all on the periodic table?
Francium (Fr)
The energy released in the reaction F(g) + e⁻ → F⁻(g) is known as the
Electron affinity
What happens to the energy of a photon if the wavelength is doubled?
Energy is reduced by one-half
Rank the following atoms in order of decreasing first ionization energies (i.e., highest to lowest): Li, Be, Ba, F. A) Ba > Li > Be > F B) F > Be > Li > Ba C) Li > Be > F > Ba D) F > Be > Ba > Li E) Ba > F > Be > Li
F > Be > Li > Ba
Halogens tend to form anions because
Gaining electrons will fill their octet faster than losing them.
What type of light on the electromagnetic spectrum has the highest energy per photon?
Gamma waves
Which element has the electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p²?
Ge
Excited hydrogen atoms emit radiation in which region(s) of the electromagnetic spectrum?
IR, visible, and UV
Which of the following elements has the smallest first ionization energy?
Ionization energy increases from left to right and from the bottom to the top of the periodic table. Cs is the furthest to the left and closest to the bottom of the periodic table on this list. It would be predicted to have the smallest first ionization energy.
What is the noble gas core in the electron configuration for Ru? A) Ne B) Ar C) Kr D) Xe E) Rn
Kr
Which of the following atoms would have the longest de Broglie wavelength, if all have the same velocity?
Li
Which of the following atom(s) below has/have five valence electrons?
N
Rank the following atoms in order of increasing size (i.e., smallest to largest): Li, Al, Be, Ba, O
O < Be < Li < Al < Ba
Which of the following elements is the most electropositive?
P
Who developed the equation that allowed the energy of the electron to be described quantum mechanically?
Schrödinger
Which of the following metals would be expected to have the smallest atomic radius?
Tantalum (Ta) The atomic radius increases as you move down the periodic table and to the left. Tantalum is the furthest to the right of this list and nearer the top and it would be expected to have the smallest atomic radius.
In the photoelectric effect, if the intensity of light shone on a metal increases, what will happen?
There will be more electrons ejected
Which of these statements is true concerning the following reaction? Na(g) → Na⁺(g) + e⁻. A) The energy required is the electron affinity B) The reaction is exothermic C) Na⁺(g) is an anion D) This is an ionization process.
This is an ionization process.
True or false: two electrons can simultaneously occupy the same (n,ℓ,mℓ) orbital.
True
What is the noble gas core in the electron configuration for Yb?
Xe
Energy of a photon is ______ proportional to frequency, and _______ proportional to wavelength.
directly, inversely
Which particle would have the longest de Broglie wavelength traveling with the same velocity?
electron
Which of the following forms of radiation has the highest frequency?
gamma rays
In which direction in a given period of the periodic table does melting point tend to increase?
he closer an atom is to having a half-full valence shell, the higher the melting point (high in the 'middle' of the period and low at the ends).
Elements that are most similar in their properties are found _____
in the same group.
Red light has a _____ frequency and a _____ wavelength than ultraviolet rays.
lower, longer
A single electron in an orbital has quantum numbers n = 2, ℓ = 0, mℓ = 0, ms = +½. What are the quantum numbers for the next electron added to this atom?
n = 2, ℓ = 0, mℓ = 0, ms = -½
Which of the following sets of quantum numbers is not allowed?
n = 2, ℓ = 2, mℓ = 2
A ground state atom of Mg could not have any electrons with which of the following configurations? A) n = 3, ℓ = 1, mℓ = 0, ms = +½ B) n = 2, ℓ = 1, mℓ = 0, ms = +½ C) n = 3, ℓ = 0, mℓ = 0, ms = +½ D) n = 2, ℓ = 0, mℓ = 0, ms = +½ E) n = 1, ℓ = 0, mℓ = 0, ms = +½
n = 3, ℓ = 1, mℓ = 0, ms = +½
Which of the following sets of quantum numbers can describe a 4s electron?
n = 4, ℓ = 0, mℓ = 0
If ℓ = 0, which of the following may be true?
n = 6
