CHEM 24112 Chapter Notes - Chapter 4: Boron, Isotopes Of Lithium, Atomic Number
29 Jun 2018
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Homework 4.4: Isotopes
1. For an atom, the number of protons and electrons is (different/the same).
2. The _____________________________ number represents the sum of the number of protons and
neutrons in a nucleus.
3. Are all atoms of the same element identical? If not, how can they differ?
4. For each of the following elements, write the element’s atomic number.
Element Atomic #
Ni
Copper
Se
Cadmium
S
Silicon
V
Xenon
5. For each of the following elements, write the element’s atomic number, symbol or name.
Atomic Number Symbol Name
14 Si
Xe xenon
79 gold
56 barium
I iodine
Sn tin
48 cadmium
6. Write the atomic symbol () for each of the isotopes described below.
a. Z = 8, the number of neutrons = 9 b. the isotope of chlorine in which A = 37
c. Z = 27, A = 60 d. Z = 3, number of neutrons = 4
e. the isotope of iodine with a mass number of 131
f. the number of protons = 26, number of neutrons = 31
7. Write the atomic symbol () for each of the isotopes described below.
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