Atomic Structure Worksheet Page 2
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16___ 18. When an electron in an atom of hydrogen moves from the second to the first
principal energy level then the result is the emission of (1) a beta particle; (2) an
alpha particle; (3) quantized energy; (4) gamma rays.
___ 19. How many occupied sublevels are in an atom of carbon in the ground state? (1) 5;
(2) 6; (3) 3; (4) 4.
___ 20. What is the total number of electrons in the 2nd principal energy level of a chlorine
atom in the ground state? (1) 5; (2) 7; (3) 8; (4) 17.
___ 21. What is the total number of neutrons in an atom of K, whose mass is 39 and atomic
number is 19? (1) 19; (2) 20; (3) 39; (4) 58.
60
___ 22. What total mass of a 16 gram sample of Co
will remain unchanged after 15.9
years? (Half life = 5.3 years) (1) 1.0 G; (2) 2.0 G; (3) 8.0 G; (4) 4.0 G.
___ 23. The amount of hydrogen chloride that the formula HCl represents is one (1) atom;
(2) gram; (3) liter; (4) molecule.
___ 24. The mass number of an atom is equal to the total number of its (1) electrons only;
(2) protons only; (3) electrons and protons; (4) protons and neutrons.
___ 25. Which electron configuration represents a neutral atom of nitrogen in an excited
2
2
3
2
2
4
2
1
4
2
1
5
state? (1) 1s
,2s
,2p
; (2) 1s
,2s
,2p
; (3) 1s
,2s
,2p
; (4) 1s
,2s
,2p
.
___ 26. How many orbitals in a sulfur atom in the ground state contain only one electron?
(1) 1; (2) 2; (3) 3; (4) 4.
___ 27. How many orbitals are completely filled in an atom of nitrogen in the ground state?
(1) 5; (2) 2; (3) 3; (4) 4.
___ 28. Which atom in the ground state has only one unpaired electron in its valence shell?
(1) boron; (2) carbon; (3) nitrogen; (4) oxygen.
___ 29. What is the total number of electrons in the 2nd principal energy level of a calcium
atom in the ground state? (1) 6; (2) 2; (3) 8; (4) 18.
36
___ 30. The number of protons in an atom of Cl
is (1) 17; (2) 18; (3) 35; (4) 36.
1
___ 31. Which is the electron configuration of a noble gas atom in the excited state? (1) 1s
;
1
1
2
2
2
2
2
(2) 1s
,2s
; (3) 1s
,2s
; (4) 1s
,2s
,2p
.
___ 32. When a chlorine atom reacts with a sodium atom to form an ion then the chlorine
atom will
(1) lose one electron; (2) lose two electrons; (3) gain one electron;
(4) gain two electrons.
___
33.
As a substance changes from a liquid to a gas the average distance between
molecules (1) decreases; (2) increases; (3) remains the same.
2-
2-
2+
1-
___ 34. An O
ion has the same electron configuration as (1) S
; (2) Ca
; (3) F
; (4) K.
___ 35. What is the maximum number of electrons that can occupy the third principal
energy level? (1) 8; (2) 10; (3) 18; (4) 32.
Atomic Structure Questions
page 2 of 8
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