Q. What is the electron configuration of a neutral sulfur atom?
-
A.
1s2 2s2 2p6 3s2 3p4
-
B.
1s2 2s2 2p6 3s2 3p6
-
C.
1s2 2s2 2p6 3s2 3p3
-
D.
1s2 2s2 2p6 3s2 3p5
Solution
Sulfur has 16 electrons, and its electron configuration is 1s2 2s2 2p6 3s2 3p4.
Correct Answer:
A
— 1s2 2s2 2p6 3s2 3p4
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Q. What is the ionization energy trend across a period?
-
A.
Increases
-
B.
Decreases
-
C.
Remains constant
-
D.
Fluctuates
Solution
Ionization energy generally increases across a period due to increasing nuclear charge.
Correct Answer:
A
— Increases
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Q. What is the primary factor affecting the periodic trends in atomic size?
-
A.
Nuclear charge
-
B.
Electron shielding
-
C.
Electron affinity
-
D.
Electronegativity
Solution
Electron shielding affects the effective nuclear charge felt by outer electrons, influencing atomic size.
Correct Answer:
B
— Electron shielding
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Q. What is the principal quantum number for the outermost electrons in a chlorine atom?
Solution
Chlorine has an atomic number of 17, and its outermost electrons are in the n=3 shell.
Correct Answer:
C
— 3
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Q. What is the trend in electronegativity as you move down a group in the periodic table?
-
A.
Increases
-
B.
Decreases
-
C.
Remains the same
-
D.
Fluctuates
Solution
Electronegativity decreases down a group due to increased atomic size and shielding effect.
Correct Answer:
B
— Decreases
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Q. Which element has the highest first ionization energy?
-
A.
Helium
-
B.
Neon
-
C.
Argon
-
D.
Krypton
Solution
Helium has the highest first ionization energy due to its small size and high effective nuclear charge.
Correct Answer:
A
— Helium
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Q. Which of the following ions has the smallest radius?
-
A.
Na+
-
B.
Mg2+
-
C.
Al3+
-
D.
Si4+
Solution
As the positive charge increases, the ionic radius decreases; Si4+ has the smallest radius.
Correct Answer:
D
— Si4+
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