Chemistry
Name: _______________________
The Atom Review
Date:__________________
Warm-up:
From your atom note packet, fill in the flow chart with the following words:
Atomic structure
electrons
protons
neutrons
atomic number
mass number
isotopes
nucleus
Unit 3 Review: The Atom Test
52 pts total
Format:



26 multiple choice
1 short answer
Fill in the table (mass #, at. #, p+, n0, e-)
Vocabulary:
 atom
 proton
 neutron
 electron
 nucleus
 neutral atom
 atomic number
 mass number
 average atomic mass
 ion
 cation
 anion
 isotope
1.
What is the difference between an ion and an isotope?
2. The average atomic mass of lithium 1s 6.941 amu. Which isotope of lithium is most
abundant, lithium-6 or lithium 7? Why?
3. What is unique about the hydrogen-1 atom?
4. In 1803, John Dalton theorized that “all atoms of the same element are identical.” Why is
this statement not true?
5. John Dalton also thought atoms were indivisible. Why is this not true?
6. What is the atomic number of the following elements?
1. Chromium
5.
Gold
2. Neptunium (Np)
6.
Cesium
3. Indium (In)
7.
Tellurium (Te)
4. Zinc
8.
Boron
7. What would the symbol and charge of the following ions be?
a. A selenium atom gains two electrons
b. A gallium atom loses three electrons
c.
A strontium atom loses two electrons
d. A potassium atom loses one electron
e.
A nitrogen atom gains 3 electrons
f.
An iodine atom that gains one electron
8. Are the ions in number 7 cations or anions?
a.
b.
c.
d.
e.
f.
9. Complete the table below.
Be sure to include the mass number with the symbol.
symbol
17
96
mass number
atomic number
12
6
number of
protons
number of
electrons
6
N
Mo
52
12
52
number of
neutrons
Cr2+
76
52
12
52
10. Complete the table below.
Be sure to include the mass number with the symbol.
symbol
7
Li
mass number
atomic number
number of
protons
number of
neutrons
7
3
20
41
Ca
72
20
137
Ba2+
137
number of
electrons
32
9
20
11. In the previous tables, why can you not get the mass number from the periodic table?
12. How many electrons are in the following ions?
a. Be2+
b. Fe2+
c. Sn4+
d. Hg2+
e. O2f.
Fr+
g.
P3-
h. Re5+
i.
Cr4+
13. The nucleus of an atom is ______________ charged and has a ________ density.
14. In which of the following sets, are the symbol of the element, the number of protons, and
the number of electrons given correctly?
a. In, 49 protons, 49 electrons
b. Zn, 30 protons, 60 electrons
c. Cs, 55 protons, 132.9 electrons
d. F, 19 protons, 19 electrons
e. He, 4 protons, 4 electrons
15. The atomic number of an element is the total number of _____________ in the nucleus.
16. An element has an atomic number of 80. How many protons and electrons are in a neutral
atom of the element?
____ protons, and ____electrons.
17. The mass number of an element is equal to the total number of __________ and
__________ in the nucleus.
18. How is the number of neutrons in an element calculated?
19. The sum of the protons and the neutrons in an atom equals the ________ __________.
20. Isotopes of the same element will have the same number of __________, but different
numbers of _____________ resulting in different mass numbers.
21. ______________ discovered electrons.
22. Atoms of the same element with different numbers of neutrons are called ___________.
23. Rutherford proved the existence of the __________ through the gold foil experiment.
24. The _______ is the smallest particle of an element that retains the properties of that
element.
25. The sum of the protons and neutrons in an atom equals the _______________.
Fill in the following table.
Particle
14. proton
15. electron
16. neutron
Symbol
Charge
Mass
1.67 x10-27 kg
9.11 x 10-31 kg
1.67 x10-27 kg
Relative mass (amu)
True/False, if false, change the underlined word or phrase to make the sentence or statement true.
26. The central core of the atom is called the hub. _____________
27. The mass of an electron is equal to that of a proton. _______________
28. The region around the nucleus occupied by the electrons is called the negative zone.
_________________
29. Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another
by two protons. ____________
30. The atomic number is determined by its number of protons. ____________