Question

Difficulty: EasyAtomic Structure and Periodic Table

An atom is composed of a central core and surrounding subatomic particles. Match each atomic structure component on the left with its defining physical property and role on the right.

  • ProtonPositively charged subatomic particle whose total count defines the element's atomic number
  • NeutronElectrically neutral subatomic particle that resides in the nucleus and contributes to total mass
  • ElectronNegatively charged subatomic particle with very low mass that orbits outside the nucleus
  • Atomic nucleusExtremely dense central region of the atom where nearly all atomic mass is concentrated

Answer

Proton matches with the positively charged particle defining atomic number; Neutron matches with the neutral particle in the nucleus contributing to mass; Electron matches with the negatively charged particle orbiting outside the nucleus; Atomic nucleus matches with the dense central core containing nearly all atomic mass.
Each subatomic entity is matched according to its fundamental physical characteristics: protons are positively charged and determine atomic number; neutrons are uncharged nucleons that contribute to mass number; electrons are negative particles that orbit the nucleus; and the nucleus is the dense core where nearly all atomic mass is located.

Step-by-Step Solution

1
Identify the charge, location, and function of a proton
Protons are positively charged (+1+1) nucleons whose count equals the atomic number (ZZ).
Every unique chemical element is defined by its unique number of protons.
2
Identify the charge, location, and function of a neutron
Neutrons are neutral (00 charge) nucleons that contribute to the atom's total mass number (AA).
Neutrons provide nuclear stability and mass without affecting net nuclear charge.
3
Identify the charge, location, and function of an electron
Electrons are negatively charged (−1-1) particles located in electron shells surrounding the nucleus.
Electrons balance positive nuclear charge in neutral atoms and determine bonding behavior.
4
Identify the structural definition and mass distribution of the atomic nucleus
The atomic nucleus is the dense central region containing all protons and neutrons.
Because protons and neutrons are roughly 18361836 times more massive than electrons, nearly all mass is located at the center.

Key Concept

Subatomic particle properties, charges, and atomic architecture
Estimated Time:45s
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