Use the periodic table to write the chemical symbols for the following elements:
a - VCE - SSCE Chemistry - Question 1 - 2002 - Paper 1
Question 1
Use the periodic table to write the chemical symbols for the following elements:
a. The element that forms a –2 ion with the electron configuration 1s²2s²2p⁶3s²3p⁵
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Worked Solution & Example Answer:Use the periodic table to write the chemical symbols for the following elements:
a - VCE - SSCE Chemistry - Question 1 - 2002 - Paper 1
Step 1
a. The element that forms a –2 ion with the electron configuration 1s²2s²2p⁶3s²3p⁵
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Answer
The element with the electron configuration 1s22s22p63s23p5 is chlorine (Cl), which can gain two electrons to achieve the stable electron configuration of 1s22s22p63s23p6, forming a –2 ion.
Step 2
b. An element from period three that forms a basic oxide
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Sodium (Na) is an example of an element from period three that forms a basic oxide (Na₂O).
Step 3
c. The element from period three with the largest atomic radius
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The element from period three with the largest atomic radius is sodium (Na) due to its lower nuclear charge compared to other elements in the same period.
Step 4
d. An element from period four that can form complex ions
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Titanium (Ti) is an element from period four that can form complex ions, such as titanium(IV) chloride (TiCl₄).
Step 5
e. The most electronegative element in group VII
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The most electronegative element in group VII is fluorine (F), which has the highest electronegativity value.
Step 6
f. The first transition series element that forms a +3 ion with a half-filled d sub-shell
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Answer
Chromium (Cr) is the first transition series element that can form a +3 ion, with the electron configuration for Cr being [extAr] 3d⁵ 4s¹, where the 3d sub-shell has a half-filled configuration.
