Question

Which of the following reactions led to the discovery of neutron?

• A. ${}_6^{12}C{+}_1^{1}H{\to }_7^{14}N{+}_0^{I}n$
• B. ${}_{11}^{5}C{+}_1^{2}D{\to }_6^{12}C{+}_0^{I}n$
• C. ${}_4^{9}Be{+}_2^{4}He{\to }_6^{12}C{+}_0^{1}n$
• D. ${}_4^{8}C{+}_2^{4}He{\to }_6^{11}C{+}_0^{1}n$

Answer 1

The correct option is C ${}_4^{9}Be{+}_2^{4}He{\to }_6^{12}C{+}_0^{1}n$

In 1930 it was discovered that Be bombarded by alpha particles and emitted stream of radiation. In 1932 Chadwick proposed that the particle is Rutherford's neutron.

${}_2^4\alpha {+}_4^{9}Be{\to }_6^{12}C{+}_0^{1}n$