alleryStart learning →Which sub-particle was discovered LAST?
AElectron
BProton
CPhoton
DNeutron
Answer & Solution
Correct answer: D. Neutron
1. Thomson identified the electron in 1897.
2. Rutherford identified the proton around 1917.
3. Chadwick discovered the neutron in 1932.
4. So the neutron was discovered last among electron, proton and neutron.
_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
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?An ion is formed when an atom: