Home › ICSE Class 8 › Chemistry › Alcohols Phenols Ethers › Which best describes radioactivity introduced in…
Which best describes radioactivity introduced in the chapter?
AGain of neutrons by a stable nucleus
BLoss of electrons from a stable atom
CSpontaneous emission of radiation by unstable nuclei
DHeat released when atoms combine to form bonds
Answer & Solution
Correct answer: C. Spontaneous emission of radiation by unstable nuclei
1. The chapter introduces radioactivity as a property of certain elements.
2. Their nuclei are unstable and spontaneously emit particles or rays.
3. This emission is called radioactivity.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on radioactivity_
Related questions
Besides VSEPR and the Kossel Lewis approach, which two theories are listed?Which theory is abbreviated VSEPR?Why can lattice enthalpy not be calculated directly from attraction and repulsion alone?Ionic bonds form most easily between elements with low ionization enthalpies and high negaWhat is the lattice enthalpy of sodium chloride?Lattice enthalpy is the energy required to separate one mole of an ionic solid into:The structures contributing to a resonance hybrid are called:Why was the concept of resonance introduced?