MCQ
The number of electrons in the atom which has $20$ protons in the nucleus
- ✓$20$
- B$10$
- C$30$
- D$40$
✓
Answer
Correct option: A.
$20$
a
(a) Nucleus of $20$ protons atom having $20 $ electrons.
(a) Nucleus of $20$ protons atom having $20 $ electrons.
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
What is the product of the reaction of $1, 3-$butadiene with $Br_2$
→Strongest reducing agent is
Ratio of masses of proton and electron is
Consider the following statements:
→$(A)$ The principal quantum number $'n'$ is a positive integer with values of $'n'=1,2,3, \ldots$.
$(B)$ The azimuthal quantum number $'l'$ for a given $'n'$ (principal quantum number) can have values as $'l'=0,1,2, \ldots n$
$(C)$ Magnetic orbital quantum number $'m _{l}'$ for a particular $'l'$ (azimuthal quantum number) has $(2 l$ + 1) values.
$(D)$ $\pm 1 / 2$ are the two possible orientations of electron spin.
$(E)$ For $l=5$, there will be a total of $9$ orbital.
Which of the above statements are correct?
$2.5 \mathrm{~mL}$ of $\frac{2}{5} \mathrm{M}$ weak monoacidic base $\left(\mathrm{K}_{\mathrm{b}}=1 \times 10^{-12}\right.$ at $\left.25^{\circ} \mathrm{C}\right)$ is titrated with $\frac{2}{15} \mathrm{M} \mathrm{HCl}$ in water at $25^{\circ} \mathrm{C}$. The concentration of $\mathrm{H}^{+}$at equivalence point is $\left(\mathrm{K}_W=1 \times 10^{-14}\right.$ at $\left.25^0 \mathrm{C}\right)$
→Irrespective of the source, pure sample of water always yields $88.89\%$ mass of oxygen and $11.11\%$ mass of hydrogen. This is explained by the law of
→The compound insoluble in acetic acid is
Calcium carbide + heavy water $ \to$ ?
The product of the above reaction is
→The product of the above reaction is
Correct configuration of the following is
The enthalpy change for the reaction of $ 50.00 \,ml$ of ethylene with $ 50.00\, ml $ of ${H_2}$ at $1.5\, atm $ pressure is $\Delta H = - 0.31\,kJ$. The value of $\Delta E$ will be
→