SUMMER WORK: BASIC ATOMIC STRUCTURE 2
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.
1) The element europium is used to trace, identify and safeguard, paper money, like the euro. It exists naturally as two
isotopes. Given the following information the relative atomic mass of the two europium isotopes. Record your
answer with only 2 decimal places. Show your work.
Isotopic Mass (μ)
Percent abundance or frequency
2) The readings have been very careful to emphasize the relationship regarding the number of protons & the number of
electrons, when discussing atoms and ions. Using the terms atom and ion, describe the relationship between protons
and electrons in each type of chemical species. (Note that the space is limited … get to the heart of the issue …There is no need to re-word the
For questions 3 – 9 use the following symbols and your grasp of basic atomic structure. A choice may be used
once, more than once, or not at all.
1) an atom of Na-26
2) an atom of S-30
____3) Which species has the greatest number of neutrons?
____4) Which species has 16 protons?
____5) Which species has the smallest atomic number?
____6) Which species has 18 electrons?
____7) Which species has a number of electrons equal to the number of electrons found in Ne-20?
____8) Which species has the greatest nuclear charge?
____9) Which species has only 11 electrons?
Turn this over and go on…
___10) Which of the following statements is/are FALSE regarding atomic structure?
I) The number of neutrons and protons of an atom must be equal to each other.
II) One conclusion of the Gold Foil experiment, was the uniform distribution of protons and electrons.
III) The neutron lessens the repulsive force between protons of a nucleus.
Only statement I is false
Only statement III is false
Both statements I and III are false
Both statements I and II are false
DIRECTIONS: For questions 11&12 use the following choices:
True statement and correctly explains (or predicts) the assertion
True statement but does NOT correctly explain the assertion
Mr. D. is a science teacher.
Mr. D. is wearing glasses.
ANSWER: Both statements are true. However, the wearing of glasses has NOTHING TO DO
with Mr. D being a science teacher. Therefore, the BEST answer is “2”.
One conclusion of The Gold Foil
experiment was that the atom is mostly
Each nucleus has a positive nuclear charge.
An alpha particle has a charge of +2.
An alpha particle has 4 protons.