Question
What is meant by nuclear mass defect?
✓
Answer
Nuclear Mass Defect :
The difference between the total mass of protons and neutrons present in the nucleus and the actual mass of the nucleus is called mass defect.
Mass defect $=$ Mass of the nucleus obtained by
calculation $-$ Actual mass of the nucleus
$\Delta m=m_c-m_a$
Here, the calculated mass is abbreviated as $m _{c}$ and the actual mass is shown as $m_a$.
Therefore, $ \Delta m=[$ Mass of protons $+$ Mass of neutrons$] -$ Actual mass of nucleus
or $\quad$
$\Delta m=\left[ Z \cdot m_p+(A-Z) m_n\right]-m$
where$, Z$ is the atomic number of the atom$, A$ is the mass number, $m_p$ is the mass of the proton, $m_n$ is the mass of the neutron and $m$ is the actual mass of the nucleus.
The difference between the total mass of protons and neutrons present in the nucleus and the actual mass of the nucleus is called mass defect.
Mass defect $=$ Mass of the nucleus obtained by
calculation $-$ Actual mass of the nucleus
$\Delta m=m_c-m_a$
Here, the calculated mass is abbreviated as $m _{c}$ and the actual mass is shown as $m_a$.
Therefore, $ \Delta m=[$ Mass of protons $+$ Mass of neutrons$] -$ Actual mass of nucleus
or $\quad$
$\Delta m=\left[ Z \cdot m_p+(A-Z) m_n\right]-m$
where$, Z$ is the atomic number of the atom$, A$ is the mass number, $m_p$ is the mass of the proton, $m_n$ is the mass of the neutron and $m$ is the actual mass of the nucleus.
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