NAME ______________________________
SUMMER WORK: BASIC ATOMIC STRUCTURE 1
DIRECTIONS: Use your summer work, internet sites, and/or textbook to complete each of the following. Be sure to
select or provide the best possible answer. It is due tomorrow, at the start of class.
Your “fill-in” answer for question 1 does not need to be extensive. You will note that the space for your answer is limited. All I’m looking for are
the “meat and potatoes”….Keep the antipasto, the salad, the dessert … just provide the basics to get to the heart of the understandings. Do NOT reword the questions, in these very short responses.
1) Explain why the nucleus of an atom has a positive charge. __________________________________
______________________________________________________________________________
_________2) Xenon-133 is used to detect lung malfunctions. An atom of xenon has an atomic number of 54.
How many neutrons are in an atom of Xenon-133?
____3) Which of the following three statements is/are FALSE regarding the isotopes of an element?
I) Isotopes of an element have the same number of protons
II) Isotopes of an element have the same number of neutrons
III) Isotopes of an element have the same number of nucleons
1)
2)
3)
4)
Only statement I is false
Only statement III is false
Both statements I and III are false
Both statements II and III are false
For questions 4 – 8 use the following symbols and your grasp of basic atomic structure. A choice may be used
once, more than once, or not at all.
29 -4
+3
1) 26
2) 27
3) 14
Si
12Mg
13Al
____4) Which symbol represents a species with 15 neutrons?
____5) Which symbol represents the species with the fewest number of electrons?
____6) Which symbol represents the species with the greatest nuclear charge?
____7) Which symbol represents the species with the greatest mass?
____8) Which symbol represents a cation?
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____9) Which set of symbols represents chemical species with the same nuclear charge?
1) Ne, Na1+, Cl1-
2) C, N, O
3) O, O2-, O2+
4) Ca2+, Sc2+, Ti2+
10) Which species has the greater number of electrons; K1+ or O2- ? __________ Using some simple
arithmetic, &/or a short explanation defend your response.
Turn This Over
11) Lithium consists of two naturally occurring isotopes. 92.41% of lithium atoms is lithium-7, each atom with
a mass of 7.016004 μ. The remaining atoms of the sample are Li-6 atoms with a mass of 6.015122μ.
Calculate the relative atomic mass, of lithium. Show your work. You should record your answer with only
two decimal places.
_____________μ Answer