Download 3. Represents an atom that has four valence electrons.

AP Chemistry Name ____________________________
Atomic Structure and Electrons Review
Questions 1-4 refer to atoms for which the occupied atomic orbitals are shown below:
1. Represents an atom that is chemically unreactive
2. Represents an atom in an excited state
3. Represents an atom that has four valence electrons.
4. Represents an atom of a transition metal.
5.
The most abundant isotopes of hydrogen and oxygen are 11H ,12H ,168O,178O, respectively. Using these isotopes
only, what is the number of different possible values for the molar mass of water?
(A) 2
6.
(C) 4
(D) 6
(E) 8
Which pair of atoms represents nuclei that have the same number of neutrons?
(A)
(B)
(C)
(D)
(E)
7.
(B) 3
56
Co and 58Co
Mn and 57Fe
58
Ni and 57Fe
58
Ni and 57Co
59
Ni and 56Co
57
Which oxides of manganese, Mn, have percent mass of manganese that is greater than 50%?
I.
MnO
II.
MnO2
III.
Mn2O3
(A)
(B)
(C)
(D)
(E)
II only
III only
I and III only
II and III only
I, II and III
h = 6.63 × 10-34 J•s
c = 3.00 × 108 m/s
RH = 2.18 × 10-18J
8.
The emission spectrum of gold shows a line of wavelength 2.676 x 10-7 m. How much energy is emitted
during this transition?
(A) 7.43 x 10-19 J
(B) 5.30 x 10-20 J
(C) 6.05 x 10-19 J
(D) 3.60 x 10-20 J
(E) 5.16 x 10-20 J
9. Which of the responses contains all the statements that are consistent with the Bohr theory of the atom (and
no others)?
(I) Only orbits of specific radii, corresponding to certain definite energies, are permitted for electrons in an
atom.
(II) An electron in a permitted orbit has a specific energy and is an "allowed" energy state.
(III) Energy is only emitted or absorbed by an electron as it moves from one allowed energy state to
another.
(A) I,II,III
(B) I only
(C) III only
(D) I and II
(E) II and III
10. The Heisenberg Principle states that _____________.
(A) no two electrons in the same atom can have the same set of four quantum numbers.
(B) two atoms of the same element must have the same number of protons.
(C) it is impossible to determine accurately both the position and momentum of an electron
simultaneously.
(D) electrons of atoms in their ground states enter energetically equivalent sets of orbitals singly before
they pair up in any orbital of the set.
(E) charged atoms (ions) must generate a magnetic field when they are in motion.
11. Which atomic orbital is spherical in shape?
(A) 2s
(B) 3p
(C) 3d
(D) 4f
(E) they are all spherical
12. 1s2 2s22p6 3s23p3
Atoms of an element, X, have the electronic configuration shown above. The compound most likely
formed with magnesium, Mg, is…
(A) MgX
(B) Mg2X
(C) MgX2
(D) MgX3
(E) Mg3X2
13. In which of the following groups are the three species isoelectronic, i.e. have the same number of… electrons?
(A)S2-,K+,Ca2+
(B)Sc,Ti,V2+
(C)O2-,S2-,Cl(D)Mg2+,Ca2+,Sr2+
(E)Cs, Ba2+, La3+
14. Fill in the table below.
Symbol
79
34
15.
Atomic
number
Mass
number
number of
protons
number of
neutrons
number of
electrons
Se 2
Ernest Rutherford bombarded alpha particles at gold foil. His experiments lead him to conclude two things
about the nature of the atom. Fill in the chart below.
Conclusion about the Atom
Experimental Evidence Supporting the Conclusion
Atoms are mostly empty space
Some of the alpha particles were deflected at a variety of
angles
16. Write the formula for the following:
17.
a.
magnesium perchlorate
_______________________
b.
aluminum nitrite
_______________________
c.
iron(III) sulfite
_______________________
d.
dinitrogen trioxide
_______________________
Name the following compounds:
a.
BaCr2O7
_____________________________
b.
KMnO4
_____________________________
c.
CCl4
_____________________________
c.
NH4NO3
_____________________________