While exploring the glowing remnants of an ancient nebula, an automated probe collects a pristine mineral dust sample and measures its fundamental building blocks. The onboard atomic scanner reveals that every single atom in the specimen contains exactly 6 protons in its nucleus, though some atoms possess 6 neutrons while others possess 7 neutrons. Based on modern atomic theory, which conclusion accurately classifies this extraterrestrial substance?

A) It is a chemical compound because the individual particles contain unequal numbers of neutrons.

B) It is a mixture of two distinct elements because atoms with different masses represent different chemical substances.

C) It cannot be classified as an element because stable neutral atoms must always maintain equal counts of protons and neutrons.

D) It is a pure element because all of its constituent atoms share the identical number of protons.

Atoms and elements Original Scenario-Based Practice

Chemistry · Atomic Structure · Chemistry · Atoms & Subatomic Particles

1 Chemistry practice questions on Atoms and elements. Questions built around original scenarios.

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Atomic Structure · Chemistry

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