The count of subatomic particles includes?
Show answer Hide answer
Answer: D. more than 3
Explanation
Modern particle physics reveals that subatomic particles extend far beyond protons, neutrons, and electrons, encompassing numerous fundamental entities. Standard model physics categorizes matter into a vast array of elementary particles including various quarks, leptons, gauge bosons, and hadrons. Discoveries in high-energy physics laboratories demonstrate that protons and neutrons are composite particles made of smaller constituent quarks. Historically, atoms were thought to consist of just three fundamental subatomic particles: protons, neutrons, and electrons. Particle accelerators smash subatomic particles together at near-light speeds, revealing fleeting exotic particles that existed during the early universe. Murray Gell-Mann and George Zweig independently proposed the quark model to explain the complex zoo of particles discovered in experiments.
Option A suggests two subatomic particles, which severely underestimates the complex inventory of particles recognized by modern physics. Option B suggests three subatomic particles, which reflects outdated early twentieth-century atomic models before the discovery of quarks. Option C suggests one subatomic particle, which cannot account for the diverse structure of atomic nuclei and surrounding electron clouds.
Related questions
Q1. Nucleic acids were first identified within_________________?
Show answer Hide answer
Answer: A. Pus cells
Nucleic acids were first identified within the nuclei of pus cells obtained from discarded surgical bandages. Swiss physician Friedrich Miescher examined these white blood cells in 1869 and extracted an unknown phosphoru...
Q2. The number of moles present per 1 kg of solvent is termed_________________?
Show answer Hide answer
Answer: C. molality
Molality is defined as the number of moles of solute dissolved in a solvent. This concentration unit specifies exactly one kilogram of solvent mass. Using mass rather than volume makes molality independent of temperature...
Q3. Noble gases receive their name because they are chemically__________________?
Show answer Hide answer
Answer: D. All
Noble gases receive their name because they have completely filled valence shells, making them chemically unreactive under normal conditions. Having a full valence electron shell provides extreme thermodynamic stability,...
Q4. The atomic nucleus was discovered by___________?
Show answer Hide answer
Answer: D. Rutherford
Ernest Rutherford discovered the dense atomic nucleus in 1911 through his famous gold foil scattering experiment. By firing alpha particles at ultra-thin gold foil, he observed that a tiny fraction bounced backward, prov...
Q5. Nitration of chlorobenzene yields a mixture of___________________?
Show answer Hide answer
Answer: D. A & B
Chlorine atoms on an aromatic ring activate the ortho and para positions toward electrophilic substitution. The incoming nitro group attaches at either the ortho or the para position relative to chlorine. Consequently, t...
Q6. Non-metals typically form oxides that are _________________?
Show answer Hide answer
Answer: A. Acidic
Non-metals typically react with oxygen to form covalent oxides that dissolve in water to produce acidic solutions. These non-metallic oxides act as Lewis acids by accepting electron pairs or reacting with water molecules...