Structure of matter — the basic building blocks All matter is fundamentally composed of which set of subatomic particles?

Introduction / Context:
Atomic theory explains material behavior, bonding, and physical properties. Recognizing the fundamental subatomic particles anchors further study in chemistry and physics.

Given Data / Assumptions:

• We refer to ordinary matter, ignoring deeper constituents like quarks for introductory level.
• Atoms consist of a nucleus and an electron cloud.

Concept / Approach:
The atom comprises a positively charged nucleus with protons (positive) and neutrons (neutral), surrounded by negatively charged electrons. Ion formation results from gain or loss of electrons but does not introduce new fundamental particle types beyond these three at this level.

Step-by-Step Solution:
Identify core subatomic particles: proton, neutron, electron.Exclude fixed ratios like “two protons per neutron/electron” which are not general truths.Exclude “charged ions” since ions are atoms/molecules with net charge, not fundamental particles.

Verification / Alternative check:
All elements in the periodic table are defined by proton number; isotopes differ by neutron number; chemistry is governed by electron configuration.

Why Other Options Are Wrong:

• Two protons per neutron or electron: no universal ratio exists across elements and isotopes.
• Electrons, neutrons, and charged ions: ions are composite entities, not elementary constituents.

Common Pitfalls:

• Confusing ions (charged atoms or molecules) with subatomic particles.

Final Answer:
Electrons, neutrons, and protons