Chapter 8 Flashcards
An isotope represented as S-34
is an isotope of sodium.
has 34 protons.
must have exactly 18 electrons.
contains exactly 18 neutrons.
contains exactly 18 neutrons.
As a sample of a radioactive nuclide decays, its half-life
decreases
remains the same
increases
any of the above, depending upon the nuclide
remains the same
Group 2A elements are also called:
noble gases.
halogens.
alkaline earth metals.
alkali metals.
alkaline earth metals.
Group 7A elements are also called:
noble gases.
halogens.
alkaline earth metals.
alkali metals.
halogens.
How many carbon atoms are in the formula Al2(CO3)3?
1
6
3
9
3
How many of each type of atom are there in the formula Ca3(PO4)2?
Ca = 3, P = 2, O = 8
Ca = 3, P = 1, O = 4
Ca = 3, P = 2, O = 4
Ca = 3, P = 1, O = 8
Ca = 3, P = 2, O = 8
How many protons and electrons are present in O-2 ?
16 protons and 8 electrons
8 protons and 10 electrons
10 protons and 8 electrons
8 protons and 8 electrons
8 protons and 10 electrons
Metalloids are located where on the periodic table?
left side
right side
middle
zig-zag diagonal line
zig-zag diagonal line
Metals are located where on the periodic table?
left side
right side
middle
zig-zag diagonal line
left side
The atoms of the isotopes of an element are different in which one or more of the following?
number of electrons
number of protons
number of neutrons
number of neutrons
The names of the elements whose symbols are Si, P, Mn, and S are respectively:
silver, phosphorus, magnesium, and sulfur.
silicon, potassium, magnesium, and sulfur.
silicon, phosphorus, magnesium, and sulfur.
silicon, phosphorus, manganese, and sulfur.
silicon, phosphorus, manganese, and sulfur.
The nucleus of an atom cannot be said to
contain most of the atom’s mass
be small in size
be electrically neutral
deflect alpha particles that come near it
be electrically neutral
The number of electrons in an atom determines its
mass
binding energy
number of neutrons
chemical properties
chemical properties
What is the atomic symbol for silver?
Ag
Au
S
Si
Ag
What is the charge on the ion formed by aluminum?
3-
13+
3+
5-
3+
What is the charge on the ion formed by selenium?
2-
1-
2+
1+
2-
What is the correct chemical symbol for mercury?
Hm
My
Me
Hg
Hg
What is the correct formula for a potassium ion with 18 electrons?
K+
P-
P+
K-
K+
What is the formula mass of copper(II) fluoride?
90.00
101.55
165.10
146.10
101.55
When a nucleus undergoes radioactive decay, its new mass number is
always less than its original mass number
always more than its original mass number
never less than its original mass number
never more than its original mass number
never more than its original mass number
Which formula shows the proper use of parentheses?
Ca(SO4)
Ca(F)2
(NH4)3(PO4)
Ca(NO3)2
Ca(NO3)2
Which of the following elements has an atomic number of 4?
C
H
Be
He
Be
Which of the following has the largest formula mass?
H2O
NO2
SiO2
SO2
So2
Which of the following is NOT a correct name, symbol combination?
beryllium, Be
silicon, Si
phosphorus, P
manganese, Mg
manganese, Mg
