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Name _________________________________________
Period _____
Chapter # 3 Test A
1. (3 points; 1 for 1st 2, 1 for next 3, 1 for symbol) A nucleus with 17 neutrons and 16
protons that is surrounded by 18 electrons is a negative ion of the element sulfur. The
mass # is 33. The atomic number is 16. The charge is -2. Write the nuclear symbol
below.
33
16
S
-2
2. A negative charge will…
I. attract a positive
II. repel a positive
III. repel a negative
e. I and III
3. Which statements are true?
I. A cathode ray is made up of gamma particles.
II. A cathode ray carries a positive charge.
III. A cathode ray cannot be deflected.
h. None of them
4. Which statements are true?
I. An alpha particle carries a negative charge.
II. Ions of the same element contain different numbers of protons.
III. Radioactivity results from changes in the atom’s nucleus.
c. III only
5. Isotopes of the same element contain different numbers of neutrons.
8. (2 points) Determine the number of protons, neutrons, electrons, and mass # in the
following.
111 -1
I
p+ = 53
n° = 58
e–= 54
mass # = 111
11. (2 points) An atom is made up of tiny electrons which orbit around a nucleus of
protons and neutrons which are similar in size.
12. (3 points) Write the roman numeral of each model that fits the description.
I. electron cloud
II. Plum pudding
III. Rutherford’s
IV. Bohr’s
Shows electrons – all
Has something wrong with it – all
Includes empty space – I, III, IV
13. (2 points) Tell me 2 parts of Dalton’s atomic theory that are still relevant today?
All matter is composed of extremely small particles called atoms.
Atoms of different elements combine in simple whole-numbered ratios to form chemical
compounds.
In chemical reactions, atoms are combined, separated, or rearranged.
14. Calculate the maximum number of electrons that can fit in the 8th energy level.
128
15. Most of an atom is empty space.
Name _________________________________________
Period _____
Chapter # 3 Test B
1. (3 points; 1 for 1st 2, 1 for next 3, 1 for symbol) A nucleus with 17 neutrons and 15
protons that is surrounded by 18 electrons is a negative ion of the element phosphorous.
The mass # is 32. The atomic number is 15. The charge is -3. Write the nuclear symbol
below.
32
15
P
-3
2. A negative charge will…
I. repel a positive
II. attract a positive
III. attract a negative
b. II only
3. Which statements are true?
I. A cathode ray is made up of alpha particles.
II. A cathode ray carries a negative charge.
III. A cathode ray cannot be deflected.
b. II only
4. Which statements are true?
I. A beta particle carries a negative charge.
II. Ions of the same element contain different numbers of neutrons.
III. Radioactivity results from changes in the atom’s electrons.
a. I only
5. Isotopes of the same element contain different numbers of neutrons.
8. (2 points) Determine the number of protons, neutrons, electrons, and mass # in the
following.
110
Te-2
p+ = 52
n° = 58
e–= 54
mass # = 110
11. (2 points) An atom is made up of tiny electrons which orbit around a nucleus of
protons and neutrons which are similar in size.
12. (3 points) Write the roman numeral of each model that fits the description.
I. electron cloud
II. Plum pudding
III. Rutherford’s
IV. Bohr’s
Shows a nucleus – I, III, IV
Shows specific orbitals – III, IV debatably I as well
Has something wrong with it – all
13. (2 points) Tell me 2 parts of Dalton’s atomic theory that are still relevant today?
All matter is composed of extremely small particles called atoms.
Atoms of different elements combine in simple whole-numbered ratios to form chemical
compounds.
In chemical reactions, atoms are combined, separated, or rearranged.
14. Calculate the maximum number of electrons that can fit in the 6th energy level.
2(62) = 72
15. Most of an atom is empty space.