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chem 129 exam #1

Terms in this set (19)

Ionic bonds form between
metals and nonmetals
Covalent bonds are formed between
nonmetal atoms
covalent bonds result between
the sharing of electrons
ionic bonds result between
results from the TRANSFER of electrons from one
metal atom to a non-metal, resulting in two oppositely charged ions that are subsequently attracted to each other
Which of the following compounds is most likely to be covalent?
KF CaCl2 SF4 MgO CaSO4
SF4
1. Which one of the following statements about atomic structure is false?
A. The electrons occupy volumes of space described by orbitals.
B. Almost all of the mass of the atom is concentrated in the nucleus.
C. The number of protons and neutrons is always equal for all atoms of an element.
D. Electrons are in quantized energy levels.
E. The protons and neutrons are found in the nucleus.
C. The number of protons and neutrons is always equal for all atoms of an element.
Use the following information to identify the atom or ion:
8 protons, 8 neutrons, and 10 electrons.
A. S+2
B. O-2
C. O+2
D. S-2
E. Ne
B. O-2
In an atom, how many electrons can have the quantum number designations
n = 3
l = 1
ms = +½
A. 5
B. 3
C. 1
D. 0
E. 2
B. 3
For a given arrangement of ions, the lattice energy increases as ionic radius
__________ and as ionic charge __________.
A. decreases, increases
B. increases, decreases
C. increases, increases
D. decreases, decreases
E. This cannot be predicted.
A. decreases, increases
Electronegativity __________ from left to right within a period and __________
from top to bottom within a group.
A. decreases, increases
B. increases, increases
C. increases, decreases
D. stays the same, increases
E. increases, stays the same
C. increases, decreases
Which of the following elements has the largest first ionization energy?
A. O
B. B
C. I
D. Cs
E. S
A. O
Which of the following has the smallest atomic radius?
A. N
B. B
C. Al
D. Be
E. C
A. N
Consider the carbonate ion CO3(-2)
9. What are the electron domain geometry (eg) and molecular geometry (mg) of CO3(-2)
A. eg = tetrahedral, mg=trigonal planar
B. eg = tetrahedral, mg=tetrahedral
C. eg = tetrahedral, mg= trigonal pyramidal
D. eg = trigonal planar, mg=bent
E. eg = trigonal planar, mg=trigonal planar
E. eg = trigonal planar, mg=trigonal planar
How many resonance structures can be drawn for the carbonate (CO3-2) ion?
A. 1
B. 2
C. 3
D. 4
E. Too many to count
C. 3
Which element below has a valence electron with the following set of quantum numbers?
n = 4 l = 1 ml = -1 ms = +1/2
A. Sulfur (S)
B. Calcium (Ca)
C. Selenium (Se)
D. Iodine (I)
E. No element can have an electron with the above set of quantum numbers
C. Selenium (Se)
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