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 1s²2s²2p⁶3s²3p⁶
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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 1s²2s²2p⁶3s²3p⁶
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Answer
The element with the electron configuration given is Argon (Ar). This element can accept two additional electrons to form a –2 ion, typically associated with the element Selenium (Se), which is the one your answer should reflect as it has the capacity to form a anions.
Step 2
b. An element from period three that forms a basic oxide
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Answer
Sodium (Na) is a classic example from period three that forms a basic oxide, specifically sodium oxide (Na₂O).
Step 3
c. The element from period three with the largest atomic radius
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Answer
The element with the largest atomic radius in period three is Sodium (Na).
Step 4
d. An element from period four that can form complex ions
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Transition metals such as Titanium (Ti) from period four can form complex ions, such as TiCl₆²⁻.
Step 5
e. The most electronegative element in group VII
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Fluorine (F) is the most electronegative element in group VII.
Step 6
f. The first transition series element that forms a +3 ion with a half-filled d sub-shell
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Chromium (Cr) is a first transition series element that typically forms a +3 ion and has a half-filled d sub-shell (d³ configuration).
