7 public questions tagged with this topic.
Mass number = 56. Charge = +2.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Discovery of Subatomic Particles - Electron Proton Neutron
Mass number = 70. Charge = +2.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Discovery of Subatomic Particles - Electron Proton Neutron
Mass number = 42. Charge = +2.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Discovery of Subatomic Particles - Electron Proton Neutron
Mass number = 20 + 20 = 40.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Discovery of Subatomic Particles - Electron Proton Neutron
Protons = electrons = atomic number = 35. Neutrons = mass number - atomic number = 80 - 35 = 45.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Discovery of Subatomic Particles - Electron Proton Neutron
Neutrons = mass number - atomic number = 39 - 19 = 20.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Atomic Models - Thomson Rutherford and Bohr Model
Alpha decay ejects a helium-4 nucleus containing two protons and two neutrons. Parent nucleus therefore loses atomic number by two, shifting element position in periodic table, and mass number by four, reflecting loss of four nucleons. This contrasts with beta decay, where mass number remains unchanged and atomic number changes by one, and gamma decay where neither changes. Alpha emission is common in heavy unstable nuclei seeking stability and produces daughter nuclei with significantly lower mass, readily identifiable by alpha spectroscopy and mass balance.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
