MCQ
A nucleus represented by the symbol ${ }_{Z}^{ A } X$ has
- A$Z$ protons and $A$ neutrons
- B$A$ protons and $Z-A$ neutrons
- ✓$Z$ protons and $A - Z$ neutrons
- D$Z$ neutrons and $A -Z$ protons
✓
Answer
Correct option: C.
$Z$ protons and $A - Z$ neutrons
c
The no. of protons in the nucleus of the atom is equal to the atomic number (Z)
The no. of protons in the nucleus of the atom is equal to the atomic number (Z)
The no. of the neutrons is equal to the difference between the mass no. of the atom (A) and the Atomic no. (Z)
The mass no. of the atom (A) is equal to the sum of the no. of protons and neutrons in the nucleus.
$A \rightarrow$ Mass number $=$ Protons $+$ neutrons
$Z=$ Atomic no. $=$ No. of protons
$\therefore Z =$ Protons,
Neutrons $= A - Z$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A cell of e.m.f 1.5 V having a finite internal resistance is connected to a load resistance of 2Ω. For maximum power transfer the internal resistance of the cell should be
Four condensers are joined as shown in the adjoining figure. The capacity of each is 8 μF. The equivalent capacity between the points A and B will be
A charged particle (mass $m$ and charge $q$ ) moves along $X$ axis with velocity $V _{0}$. When it passes through the origin it enters a region having uniform electric field $\overrightarrow{ E }=- E \hat{ j }$ which extends upto $x = d$. Equation of path of electron in the region $x > d$ is
→A horizontal straight conductor kept in north-south direction falls under gravity, then
What is immaterial for an electric fuse wire
An equiconvex glass lens lens $(a)$ has a focal length $f$ and power $P$ . It is cut into two symmetrical halves $(b)$ by a plane containing the principal axis. The two pieces are recombined as shown in figure $(c)$ . The power of new combination is
→A message signal of frequency $3\,kHz$ is used to modulate a carrier signal of frequency $1.5\,MHz$. The bandwidth of the amplitude modulated wave is
→A magnet when placed perpendicular to a uniform field of strength ${10^{ - 4}}\,Wb/{m^2}$ experiences a maximum couple of moment $4 \times {10^{ - 5}}\,N/m.$. What is its magnetic moment.....$A \times {m^2}$
→A jat plane is travelling towards west at a speed of $1800\, km/h$. What is the voltage difference developed between the ends of the wing having a span of $25\,m$, if the Earth's magnetic field at the location has a magnitude of $5\times10^{-4}\, T$ and the dip angle is $30^o$
→The height of a transmitting antenna at the top of a tower is $25 \; m$ and that of receiving antenna is, $49 \; m$. The maximum distance between them, for satisfactory communication in LOS (Line of Sight) is $K \sqrt{5} \times 10^{2} \; m$. The value of $K$ is $\dots$ [Assume radius of Earth is $64 \times 10^{+5} \; m$ ] (Calculate upto nearest integer value)
→