a) 11 protons, 13 neutrons b) 11 protons, 13 neutrons, 13 electrons c) 13 protons, 11 neutrons d) 13 protons, ...

Number of protons, neutrons and electrons in the element \[_{89}X^{231}\] is a) 89, 89, 242 b) 89, 142, ...

a) \[\beta\]-particles which impinged on a metal foil and got absorbed b) \[\gamma\]-rays which impinged on a metal foil ...

Which of the following does not contain number of neutrons equal to that of \[\begin{array}{c}40\\18\end{array}Ar\] a) \[\begin{array}{c}41\\19\end{array}K\]

a) Neutron is chargeless particle b) Neutron is highly unstable particle c) Neutron in the nucleus moves very fast

a) infinite b) \[1.8 ×10^{3}\] c) 1.8 d) None of these Answer: b Explanation: Ratio of mass of proton and ...

Rutherford’s \[\alpha\]-particle dispersion experiment concludes a) all positive ions are deposited at small part b) all negative ions ...

a) A stream of electrons b) Charged particles c) Move with speed same as that of light d) Can be ...

a) Cathode rays carry negative charge b) Frequency of X-rays is higher than that of microwaves c) Unit for ...

The number of electrons in \[\left[\begin{array}{c}40\\19\end{array}K\right]^{1-}\] is a) 20 b) 40 c) 18 d) 19 Answer: a ...