HARD
JEE Main
IMPORTANT
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The number of stable isotopes is the least when the number of neutrons and protons in the isotopes are, respectively,

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Important Questions on Atomic Structure and Radioactivity

HARD
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 31
A radioactive nuclide generally disintegrates by α-emission when its N/P ratio is
MEDIUM
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 32
X8x atom is an isotone to Y917 atom. What is the value of x?
MEDIUM
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 33
If 5 g of a radioactive substance has t12=14 h, 20 g of the same substance will have a t12 equal to
MEDIUM
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 34
The designations of a proton and neutron are H11 and n01 respectively. Are the two particles of equal mass?
MEDIUM
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 35
The nuclides Ar1840 and K1941 are
MEDIUM
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 36
Which of the following nuclides are isobars?
HARD
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 37
To what stable isotope would Lr103257 decay?
MEDIUM
JEE Main
IMPORTANT
Modern Approach to Chemical Calculations>Chapter 11 - Atomic Structure and Radioactivity>Objective Problems>Q 38
The half-life of a radioactive isotope is 1.5 hours. The mass of it that remains undecayed after 6 hours is (if the initial mass of the isotope was 32 g).