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Chemistry Chapter 4 : Test Yourself
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Number of periods in the periodic table are:
Reasoning: The modern periodic table has 7 horizontal rows, called periods.
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Which of the following groups contain alkaline earth metals?
Reasoning: Group 2 elements (Be, Mg, Ca, Sr, Ba, Ra) are called alkaline earth metals because they form basic oxides.
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Which of the following elements belongs to 18?
Reasoning: ● Group 18 contains noble gases (He, Ne, Ar, Kr, Xe, Rn).● Xenon (Xe) is a noble gas.
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Main group elements are arranged in _________ groups.
Reasoning: Main group elements (s-and p-block) are arranged in 7 groups (1, 2, 13-18) ⟹ total 7 main groups.
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Period number of 13 27 Al is:
Reasoning: Aluminum (Al, atomic number 13) has configuration:1s² 2s² 2p⁶ 3s² 3p¹Highest energy level =3, so it is in period 3.
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Valence shell electronic configuration of an element M (atomic no. 14) is:
Reasoning: ● Atomic number 14= Silicon (Si)● Full configuration: 1s² 2s² 2p⁶ 3s² 3p²● Valence shell =n=3 ⟹ 3s² 3p²
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Which of the following elements you expect to have greater shielding effect?
Reasoning: Shielding increases down the group because more inner shells are added. ⟹ Order: Li<Na<K<Rb (highest shielding)
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As you move from right to left across a period, which of the following do not increase:
Reasoning: Across a period:● Nuclear charge decreases (right ⟹ left)● Atomic size increases● But shielding effect remains almost constant because electronsare added to the same shell.
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All the elements of Group 2 are less reactive than alkali metals. This is because these elements have:
Reasoning: Group 2 elements have:● higher nuclear charge● smaller tendency to lose electrons● So they require more energy to remove electrons ⟹ higherionization energy ⟹ less reactive than Group 1.
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