alleryStart learning →Alpha particles used by Rutherford in his scattering experiment are:
AProtons in standard practice
BElectrons
CHelium nuclei (He^2+)
DNeutrons
Answer & Solution
Correct answer: C. Helium nuclei (He^2+)
1. Rutherford fired alpha particles at thin gold foil.
2. Alpha particles are emitted by radioactive decay (e.g., from radium).
3. Each is a helium nucleus with 2 protons and 2 neutrons.
4. So alpha particles are doubly charged helium nuclei.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_
Keep practising Atomic Structure
Browse all Atomic Structure questions for ICSE Class 9, or explore more Chemistry topics.
Related questions
Which sub-particle was discovered LAST?If an element has the configuration 2, 8, 8, 1, its valency and likely group are:Why does the atomic mass of chlorine (35.5) lie between two integers?An atom of oxygen has Z = 8 and A = 16. Number of neutrons is:Why are protons and neutrons together called nucleons?Isotopes of hydrogen include:Chlorine (Z = 17) becomes Cl- by gaining how many electrons?Magnesium (Z = 12) forms Mg^2+ by losing how many electrons?