Regents Chemistry Exam August 2024 Question 13
13 Which substance contains only atoms with the same atomic number?
(1) ammonia (3) methane
(2) selenium (4) water
Solution:
Atoms of the same element have the same atomic number. Selenium is the only element listed and can be found on the Periodic Table. Its' name is listed on Table S of the Reference Table. The rest of answer choices are that of compounds. Choice 2 is the correct answer.
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