MCQ
The atomic number of an element is determined by:
- AThe number of electrons in one atom.
- BThe number of neutrons in one atom.
- CThe valency of the element.
- DThe number of protons in one atom.
✓
Answer
- The number of protons in one atom.
Explanation:
Atomic number is the number of protons in the nucleus of an atom and also the total positive charge in the atomic nucleus.
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
If the mixture of the following four aromatic compounds on oxidation by strong oxidising agent gives :
Enthalpy of hydrogenation of Benzene is $\Delta H_1$ and for cyclohoxene is $\Delta H_2$. Then resonance energy of Benzene is
→Which of the following is not true about a reversible reaction?
Choose the correct explanation regarding half-reaction such as $Cr _2 O _7^{2-} \rightarrow Cr ^{3+}$ from the following.
→According to molecular orbital theory, the number of unpaired electron(s) in $\mathrm{O}_{2}^{2-}$ is :
→Which reaction is $NOT$ a redox reaction?
→Which of the following has highest melting point
The total number of compounds having at least one bridging oxo group among the molecules given below is. . . . . . .
→$N _2 O _3, N _2 O _5, P _4 O _6, P _4 { O }_7, H _4 P _2 O _5, H _5 P _3 O _{10}, H _2 S _2 O _3, H _2 S _2 O _5$
$6$ moles of an ideal gas expand isothermally and reversibly from a volume of $1$ litre to a volume of $10$ litres at $27\,^oC$. What is the maximum work done? ................. $\mathrm{kJ}$
→Based on the following thermochemical equations
→${H_2}O(g) + C(s) \to CO(g) + {H_2}(g);\,\Delta H = 131\,kJ$$CO(g) + \frac{1}{2}{O_2}(g) \to C{O_2}(g);\Delta H = - 282\,kJ$
${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(g);\,\Delta H = - 242\,kJ$
$C(s) + {O_2}(g) \to C{O_2}(g);\,\Delta H = X\,kJ$ The value of $X$ is ......$kJ$