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WorksheetsAP Periodicity
Total questions: 27
Worksheet time: 46mins
Neon lighting is one application using concepts from emission spectroscopy. Which of the following best describes how the emission process works in neon lighting?
Ultraviolet light excites the neon gas to produce emitted white light.
Energy excites the neon gas to an excited state. The relaxation to ground state causes light to be emitted.
Neon gas reacts with oxygen in the air, which causes the emission of light.
none of the above.
Which of the following will have a higher electron affinity than arsenic (As)?
Carbon (C)
Neon (Ne)
Antimony (Sb)
Germanium (Ge)
Which atom has the largest atomic radius?
potassium
rubidium
neon
cesium
As you move down the periodic table atoms get bigger. This is because ____________.
The atoms have more mass.
The atoms have more protons.
The atoms have more energy levels and the shielding effect
The atoms have more neutrons
The element represented by the PES chart would most likely be
Na
Mg
K
Ca
APMCQ:
1s2 2s2 2p6 3s2 3p3
Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed with magnesium, Mg, is
MgX
Mg2X
MgX2
MgX3
Mg3X2
APMCQ:
Consider atoms of the following elements. Assume that the atoms are in the ground state.
The atom that contains exactly two unpaired electrons
S
Ca
Ga
Sb
Br
APMCQ:
Which of the following best helps explain why the electronegativity of Cl is less than that of F?
The mass of the Cl atom is greater than the mass of the F atom.
The Cl nucleus contains more protons than the F nucleus contains.
When Cl and F form bonds with other atoms, the Cl bonding electrons are more shielded from the positive Cl nucleus than the F bonding electrons are shielded from the positive F nucleus.
Because Cl is larger than F, the repulsions among electrons in the valence shell of Cl are less than the repulsions among electrons in the valence shell of F.
APMCQ:
Which of the following ground-state electron configurations represents the atom that has the lowest first-ionization energy?
1s22s1
1s22s22p2
1s22s22p6
1s22s22p63s1
APMCQ:
The diagram above represents the photoelectric effect for a metal. When the metal surface is exposed to light with increasing frequency and energy of photons, electrons first begin to be ejected from the metal when the energy of the photons is 3.3×10−19J.
Which of the following is closest to the frequency of the light with photon energy of 3.3×10−19J.
5.0×10−53 s−1
5.0×10−16 s−1
5.0×1014 s−1
5.0×1052 s−1
APMCQ:
The compound CCl4 is nonflammable and was once commonly used in fire extinguishers. On the basis of the periodic properties, which of the following compounds can most likely be used as a fire-resistant chemical?
BCl3
CH4
CBr4
PbCl2
APMCQ:
A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student prepares a set of CoCl2(aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
A wavelength of 510nm corresponds to an approximate frequency of 6×1014 s−1. What is the approximate energy of one photon of this light?
9×1047J
3×1017J
5×10-7J
4×10-19J
APMCQ:
The photoelectron spectra of the 1s electrons of two isoelectronic species, Ca2+ and Ar, are shown above. Which of the following correctly identifies the species associated with peak X and provides a valid justification?
Ar, because it has completely filled energy levels
Ar, because its radius is smaller than the radius of Ca2+
Ca2+, because its nuclear mass is greater than that of Ar
Ca2+, because its nucleus has two more protons than the nucleus of Ar has
APMCQ:
The first five ionization energies of a second-period element are listed in the table above. Which of the following correctly identifies the element and best explains the data in the table?
B, because it has five core electrons
B, because it has three valence electrons
N, because it has five valence electrons
N, because it has three electrons in the p sublevel
APMCQ:
Based on periodic trends and the data in the table above, which of the following are the most probable values of the atomic radius and the first ionization energy for potassium, respectively?
242 pm, 633 kJ/mol
242 pm, 419 kJ/mol
120 pm, 633 kJ/mol
120 pm, 419 kJ/mol
