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Questions for Regents Practice: Atomic Structure

Parts A and B-1 Multiple Choice

19. Which is a ground state electron configuration of an atom in the fourth period
of the periodic table

1) 2 – 8 – 4 3) 2 – 8 – 18 – 18 – 4
2) 2 – 8 – 18 – 4 4) 2 – 4

20. The total number of electrons found in the electron configuration of a neutral
chromium atom is
1) 24 2) 6 3) 13 4) 52

21. The highest amount of energy will be emitted by an electron when it moves from
the
1) 4 to 1 electron shell 3) 1 to 5 electron shell
st
th
th
st
th
th
st
th
2) 1 to 4 electron shell 4) 5 to 4 electron shell

(c) E3 Scholastic Publishing
3+
22. What is the total number of electrons in a Cr ion?
1) 3 2) 21 3) 24 4) 27

23. Which symbol represents a particle with a total of 10 electrons?

1) N 2) Al 3) N 4) Al 3+
3+

24. Which electron configuration represents an atom of aluminum in an excited
state?
1) 2-7-4 2) 2-8-3 3) 2-7-7 4) 2-8-6

25. Element X has two isotopes. If 72.0% of the element has an isotopic mass of
84.9 amu, and 28.0% of the element has an isotopic mass of 87.0 amu, the
average atomic mass of element X is numerically equal to

(72.0 x 84.9) (28.0 x 87.0)
1) (72.0 + 84.9) x (28.0 + 87.0) 3) ------------------ + ------------------

100 100

(72.0 x 84.9) (28.0 x 87.0)
2) (72.0 - 84.9) x (28.0 + 87.0) 4) ----------------- - ------------------
100 100

26. The diagram below represents the nucleus of an atom

What are the atomic number and mass number of this atom?

1) The atomic number is 9 and the mass number is 19.
2) The atomic number is 9 and the mass number is 20.
3) The atomic number is 11 and the mass number is 19.
4) The atomic number is 11 and the mass number is 20.

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