ATOMS AND THE PERIODIC TABLE HOMEWORK
.1.
A.
B.
C.
D.
The mass of an electron is
equal to that of a proton
equal to that of a neutron
equal to 1 a.m.u.
almost zero
The abundances of the two isotopes must be
ABUNDANCE ABUNDANCE
OF 20Ne
OF 22Ne
A
50
50
B
75
25
C
90
10
D
100
0
2.
A.
B.
C.
D.
The mass number of an atom is
the number of electrons
the number of protons
the number of electrons + neutrons
the number of protons + neutrons
8. Which of the following elements is
liquid at room temperature?
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
3. Atoms have no charge because
A. the positive charge of the protons = the
negative charge of the neutrons
B. the positive charge of the protons = the
negative charge of the electrons
C. the negative charge of the protons = the
positive charge of the electrons
D. the positive charge of the neutrons = the
negative charge of the electrons
4. To calculate the relative atomic mass of
an element we must know
A. the isotopes present
B. the mass numbers of the isotopes
present and their abundances
C. the number of isotopes present
D. the abundances of the isotopes present
5. 12C and 14C are different in that they
have
A. different atomic numbers
B. different numbers of neutrons
C. different numbers of electrons
D. different charges in their nuclei
6. Which one of the following represents a
neutral atom?
Number of Number of Number of
protons
neutrons
electrons
A 35
46
36
B
3
7
2
C
16
16
18
D 6
14
6
7. Neon has two isotopes 20Ne and 22Ne.
The relative atomic mass for neon is 20.2.
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9. Which of the following elements has the
highest melting point?
A. Copper
B. Nickel
C. Iron
D. Manganese
10. Which of the following elements is a
halogen?
A. boron
B. phosphorus
C. iodine
D. krypton
11. Which of the following elements is
stored in oil?
A. Potassium
B. Aluminium
C. Copper
D. Magnesium
12. Which of the following pairs of
elements show similar chemical properties?
A. Lithium, potassium
B. Sulphur, bromine
C. Silicon, phosphorus
D. Sulphur, nitrogen
13. Which of the following elements has 4
electrons in its outer electron shell?
A. Silicon
B. Sulphur
C. Chlorine
D. Beryllium
ATOMS AND THE PERIODIC TABLE HOMEWORK
14. Elements in the same group of the
Periodic Table all contain the same number
of
A. protons
B. outer electrons
C. electrons
D. neutrons
15. Which of the following elements is the
most reactive?
A. Lithium
B. Sodium
C. Potassium
D. Rubidium
16. Atom A has mass number 239 and
atomic number 93. Atom B has a mass
number 239 and atomic number 94.
(a) How many protons has A?
(b) How many neutrons has B?
(c) (i) Are atoms A and B of the same
element?
(ii) Explain your answer
(d) To which elements do atoms A and B
belong?
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