OCTCO/OCTF Exit Exam • Set 3 Question 23 of 30
In a sample of ethyl Ethanoate (CH3 COOC2H5) THE TWO oxygen atoms have the same number of electrons but different numbers of neutrons. Which of the following is the correct reason for it?
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Direct Answer
Option C: The two oxygen atoms are isotopes
Atoms of the same element having the same number of protons and electrons (same atomic number) but different numbers of neutrons (different mass numbers) are called isotopes.
All Options
A
One of the oxygen atoms has gained electrons
B
One of the oxygen atoms has gained two neutrons
C
The two oxygen atoms are isotopes
(Correct Answer)
D
The two oxygen atoms are isobars
Detailed Explanation & Context
Atoms of the same element having the same number of protons and electrons (same atomic number) but different numbers of neutrons (different mass numbers) are called isotopes.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).
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