Download Page 1 of 5 atomic structure 11/7/2012 http://castlelearning.com

atomic structure
Page 1 of 5
Teacher: Mr. gerraputa
Print Close
Name: ____________________________________
1.
6.
The atomic mass of an element is calculated using the
What is the symbol for an atom containing 20 protons and 22
neutrons?
1. atomic number and the ratios of its naturally occurring
isotopes
2. atomic number and the half-lives of each of its isotopes
3. masses and the ratios of its naturally occurring isotopes
4. masses and the half-lives of each of its isotopes
1.
2.
--------------
3.
4.
2.
-------------Which particles account for most of the mass of the atom?
1. protons and neutrons
2. protons and electrons
3. neutrons and electrons
4. neutrons and positrons
--------------
7.
Neutral atoms of the same element can differ in their number of
1. neutrons
2. positrons
3.
3. protons
4. electrons
--------------
As the number of neutrons in the nucleus of a given atom of an
element increases, the atomic number of that element
8.
1. decreases
2. increases
3. remains the same
--------------
Which of the following atoms has the greatest nuclear charge?
1. Al
2. Ar
3. Si
4. Na
--------------
4.
Which symbol represents an isotope of carbon?
1.
9.
An electron has a charge of
2.
1.
2.
3.
4.
3.
4.
−1 and the same mass as a proton
+1 and the same mass as a proton
−1 and a smaller mass than a proton
+1 and a smaller mass than a proton
--------------
--------------
5.
All samples of an element are composed of atoms with the same
1. atomic mass
2. atomic number
3. number of nucleons
4. number of neutrons
--------------
http://castlelearning.com/review/teacher/AssignmentPrinting.aspx
11/7/2012
atomic structure
Page 2 of 5
10.
15.
Which statement best describes the nucleus of an aluminum
atom?
Compared to an element of calcium-40, an atom of potassium39 contains fewer
1. It has a charge of +13 and is surrounded by a total of 10
1. protons
electrons.
2. neutrons
2. It has a charge of +13 and is surrounded by a total of 13
3. occupied sublevels
electrons.
4. occupied principal energy levels
3. It has a charge of −13 and is surrounded by a total of 10
-------------electrons.
4. It has a charge of −13 and is surrounded by a total of 13
electrons.
16.
-------------Which of these phrases best describes an atom?
1. a positive nucleus surrounded by a hard negative shell
2. a positive nucleus surrounded by a cloud of negative
charges
3. a hard sphere with positive particles uniformly
embedded
4. a hard sphere with negative particles uniformly
embedded
11.
In a sample of the element potassium, each atom has
1. 19 protons
2. 20 neutrons
3. 39 protons and neutrons
4. 39 neutrons
--------------
--------------
12.
17.
A particle of matter contains six protons, seven neutrons, and
six electrons. This particle must be a
1.
2.
3.
4.
Which statement best describes an electron?
1. It has a smaller mass than a proton and a negative
charge.
2. It has a smaller mass than a proton and a positive charge.
3. It has a greater mass than a proton and a negative charge.
4. It has a greater mass than a proton and a positive charge.
neutral carbon atom
neutral nitrogen atom
positively charged carbon ion
positively charged nitrogen ion
--------------
--------------
13.
18.
What is the total number of electrons in a Cu+ ion?
Which diagram represents the nucleus of an atom of
1. 28
2. 29
?
3. 30
4. 36
-------------1.
3.
2.
4.
14.
What is the total number of neutrons in an atom of
1. 82
2. 125
3. 207
4. 289
?
--------------
--------------
http://castlelearning.com/review/teacher/AssignmentPrinting.aspx
11/7/2012
atomic structure
Page 3 of 5
19.
24.
A substance that is composed only of atoms having the same
atomic number is classified as
The atomic mass of an element is defined as the weighted
average mass of that element’s
1. a compound
2. an element
1.
2.
3.
4.
3. a homogeneous mixture
4. a heterogeneous mixture
--------------
most abundant isotope
least abundant isotope
naturally occuring isotopes
radioactive isotopes
--------------
20.
What is the total number of protons in the nucleus of an F− ion? 25.
1. 8
2. 9
In an experiment, alpha particles were used to bombard gold
foil. As a result of this experiment, the conclusion was made
that the nucleus of an atom is
3. 10
4. 11
--------------
1.
2.
3.
4.
21.
smaller than the atom and positively charged
smaller than the atom and negatively charged
larger than the atom and positively charged
larger than the atom and negatively charged
Rutherford’s gold foil experiment illustrated that the atom
1.
2.
3.
4.
is mostly empty space
is densely packed with electrons
cannot be penetrated by any radiation
contains a negatively charged nucleus
--------------
--------------
26.
In Rutherford's gold foil experiments, some alpha particles were
deflected from their original paths but most passed through the
foil with no deflection. Which statement about gold atoms is
supported by these experimental observations?
22.
1.
2.
3.
4.
An ion with 5 protons, 6 neutrons, and a charge of 3+ has an
atomic number of
1. 5
2. 6
Gold atoms consist mostly of empty space.
Gold atoms are similar to alpha particles.
Alpha particles and gold nuclei have opposite charges.
Alpha particles are more dense than gold atoms.
3. 8
4. 11
---------------------------
27.
What is the total number of electrons present in an atom of
23.
?
Which pair must represent atoms of the same element?
1.
and
2.
and
3.
4.
1. 27
2. 32
3. 39
4. 86
--------------
and
and
--------------
http://castlelearning.com/review/teacher/AssignmentPrinting.aspx
11/7/2012
atomic structure
Page 4 of 5
28.
33.
If 75.0% of the isotopes of an element have a mass of 35.0 amu Which statement is true about a proton and an electron?
and 25.0% of the isotopes have a mass of 37.0 amu, what is the
1. They have the same masses and the same charges.
atomic mass of the element?
2. They have the same masses and different charges.
3. They have different masses and the same charges.
1. 35.0 amu 3. 36.0 amu
4. They have different masses and different charges.
2. 35.5 amu 4. 37.0 amu
---------------------------
29.
An atom of carbon-14 contains
1.
2.
3.
4.
8 protons, 6 neutrons and 6 electrons
6 protons, 6 neutrons and 8 electrons
6 protons, 8 neutrons and 8 electrons
6 protons, 8 neutrons and 6 electrons
--------------
30.
What is the mass number of an atom which contains 28 protons,
28 electrons and 34 neutrons?
1. 28
2. 56
3. 62
4. 90
--------------
31.
Which particle has a mass of approximately one atomic mass
unit and a unit positive charge?
1. a neutron
2. a proton
3. a beta particle
4. an alpha particle
--------------
32.
Which particle contains the greatest number of electrons?
1. Na
2. Na+
3. F
4. F−
--------------
http://castlelearning.com/review/teacher/AssignmentPrinting.aspx
11/7/2012
atomic structure
Page 5 of 5
Answer Key for atomic structure
1. 3
2. 1
3. 3
4. 3
5. 2
6. 1
7. 1
8. 2
9. 3
10. 2
11. 1
12. 1
13. 1
14. 2
15. 1
16. 2
17. 1
18. 2
19. 2
20. 2
21. 1
22. 1
23. 2
24. 3
25. 1
26. 1
27. 1
28. 2
29. 4
30. 3
31. 2
32. 1
33. 4
http://castlelearning.com/review/teacher/AssignmentPrinting.aspx
11/7/2012