Atomic Structure Worksheet Page 4
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16___ 53. Which particle has a mass of approximately 1 mass unit and a unit positive charge?
(1) neutron; (2) proton; (3) electron; (4) alpha particle.
___ 54. When a radioactive nucleus emits a beta particle then the atom's (1) mass number
is increased by 1; (2) mass number is decreased by 1; (3) atomic number is
increased by 1; (4) atomic number is decreased by 1.
___ 55. The maximum number of electrons in the 3d sublevel is (1) 6; (2) 2; (3) 8; (4) 10.
1+
1-
___ 56. Which two particles have the same electronic configuration?
(1) Cl
and F
;
1-
2-
1-
1-
(2) Cl
and S
; (3) Cl
and Ne; (4) Cl
and K.
___ 57. Which furnishes evidence that electrons in atoms are in definite energy levels?
(1) electronegativities; (2) atomic radii; (3) mass defects; (4) spectral lines.
___ 58. When an atom of chlorine becomes a chloride ion then its size
(1) decreases;
(2) increases; (3) remains the same.
___ 59. What is the maximum number of electrons that can occupy the second principal
energy level? (1) 6; (2) 8; (3) 18; (4) 32.
___ 60. The structure of an alpha particle is the same as a
(1) lithium atom; (2) neon
atom; (3) hydrogen nucleus; (4) helium nucleus.
2+
___ 61. What is the total number of electrons in a Mg
ion? (1) 10; (2) 2; (3) 12; (4) 24.
___ 62. Which atom has the strongest attraction for electrons? (1) Cl; (2) F; (3) Br; (4) I.
___ 63. Which species has a negative charge?
(1) a lithium ion; (2) an alpha particle;
(3) an aluminum ion; (4) a beta particle.
___ 64. Which atom in the ground state has three unpaired electrons in its outermost
principal energy level? (1) Li; (2) B; (3) N; (4) Ne.
___ 65. What is the total number of valence electrons in an atom of phosphorus in the
ground state? (1) 5; (2) 2; (3) 3; (4) 7.
___ 66. Which particle is electrically neutral?
(1) proton; (2) positron; (3) neutron;
(4) electron.
___ 67. An atom that contains 35 protons, 45 neutrons, and 35 electrons has an atomic
number of (1) 35; (2) 45; (3) 80; (4) 115.
___ 68. An electron has a charge identical to that of (1) a neutron; (2) a proton; (3) an
alpha particle; (4) a beta particle.
___ 69. Two isotopes of the same element will have the same number of (1) neutrons and
electrons; (2) neutrons and nucleons; (3) protons and nucleons; (4) protons and
electrons.
___ 70. What is the number of orbitals in the first principal energy level?
(1) 1; (2) 2;
(3) 3; (4) 4.
___ 71. The maximum number of sublevels in the second principal energy level is
(1) 1;
Atomic Structure Questions
page 4 of 8
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