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Question 1
Naturally occurring chlorine consists of two stable isotopes: ³⁵Cl and ³⁷Cl. Which statement correctly compares an atom of ³⁵Cl with an atom of ³⁷Cl?
Correct Answer:
Both isotopes have 17 protons and 17 electrons, but ³⁷Cl has 20 neutrons while ³⁵Cl has 18 neutrons.
Question 2
What is the ground-state valence electron configuration and the number of unpaired electrons in an isolated phosphorus atom (Z = 15)?
Correct Answer:
3s² 3p³ with 3 unpaired electrons
Question 3
Which of the following represents the anomalous ground-state electron configuration of a neutral copper atom (₂₉Cu)?
Correct Answer:
[Ar] 3d¹⁰ 4s¹
Question 4
How does atomic radius change across Period 3 of the Periodic Table from sodium (Na) to chlorine (Cl), and what is the primary reason?
Correct Answer:
It decreases because the effective nuclear charge increases while the number of electron shells remains constant.
Question 5
Why is the first ionization energy of nitrogen (N, Z = 7) higher than that of oxygen (O, Z = 8), despite oxygen having a higher nuclear charge?
Correct Answer:
Nitrogen has a stable half-filled 2p³ subshell, whereas oxygen has paired electrons in a 2p orbital that experience inter-electronic repulsion.
Question 1
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Prepare with the ЦТ Chemistry Practice Questions - ЦТ ЦЭ Chemistry (Belarus Centralized Testing Centralized Exam) Exam practice quiz. This question bank includes 94 questions covering reaction, acid, sodium, aqueous, and iron. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ЦТ Chemistry Practice Questions - ЦТ ЦЭ Chemistry (Belarus Centralized Testing Centralized Exam) Exam

This practice set contains 94 questions from the matching question bank and focuses on reaction, acid, sodium, aqueous, and iron. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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