Description
1) The primary substances of which all other things are composed are
A) molecules.
B) compounds.
C) elements.
D) electrons.
E) protons.
2) Which of the following is a characteristic of the modern periodic table?
A) A group is a horizontal row on the periodic table.
B) A period is a column on the periodic table.
C) The elements in each group have similar chemical properties.
D) The elements in each period have similar chemical properties. FUoa
E) All of the above
4) The Group 18 elements — !
A) are unreactive and are rarely found in combination with other elements.
B) are good conductors of electricity.
C) melt at high temperatures.
D) are ductile
E) react vigorously with water.
5) Which of the following elements is a metal?
A) nitrogen
B) fluorine
argon
D) trontium
phosphoru
6) Which of the following is a characteristic of nonmetals?
A) shiny
B) malleable
C) good conductors
D) low melting points
E) ductile
27) Which of the following gives the correct numbers of protons, neutrons, and electrons in
a neutral atom of I Sn?
A) 118 protons, 50 neutrons, 118 electrons
B) 118 protons, 1 18 neutrons, 50 electrons
C) 50 protons, 68 neutrons, 50 electrons
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D) 68 protons, 68 neutrons, 50 electrons
E) 50 protons, 50 neutrons, 50 electrons
28) Isotopes are atoms of the same element that have
A) different atomic numbers.
B) the same atomic numbers but different numbers of protons.
C) the same atomic numbers but different numbers of electrons.
D) the same atomic number but different numbers of neutrons.
E) the same atomic mass but different numbers of protons.
29) The correct symbol for the isotope of potassium with 22 neutrons is
A) 4.1K.
B) 19K.
41
E) 22K.
19
31) The atomic mass of an element is equal to
A) its mass number.
B) its atomic number.
C) one-twelfth of the mass of a carbon- 12 atom.
D) a weighted average mass of all of the naturally occurring isotopes of the element.
E) the average mass of all of the naturally occurring isotopes of the element.
32) A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0
amu) makes up 75.8% of the sample, and the isotope (21-37 (mass = 37.0 amu) makes up
24.3% of the sample. What is the average atomic mass for chlorine?
A) 36.0 amu
B) 35 amu
C) 36.6 amu
D) 35.5 amu
E) 35.521 amu
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33) A sample Of silicon has three naturally occurring isotopes: Si-28 (mass 28.0 amu); Si-29
(mass 29.0 amu) and Si-30 (mass = 30.0 arnu). If the average atomic mass of silicon is 28.1
amu, which isotope is the most abundant?
A) Si-28
B) Si-29
C) Si-30
D) All isotopes have the same natural abundance.
