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Atomic Number(Z), Mass number(A), Isotopes and Isobars - (Concept)
Atomic number (z) = number of protons in the nucleus of an atom
Mass number (A) = sum of neutrons and protons in the nucleus
Isotopes = Atoms having the same atomic number but a different mass number.
Isobars = Atoms with same mass number but different atomic number
| Exam | Chapter |
| JEE MAIN | Atomic Structure |
has 56 electrons, the atomic number of X is______ :
| A. |
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| B. |
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| C. |
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| D. |
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Atomic mass number depends upon:
| A. |
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| B. |
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| C. |
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| D. |
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19.9% of au boron atoms are , 80.1 % are
. The approximate atomic mass of Boron is :
| A. |
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| B. |
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| C. |
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| D. |
|
19.9% of all boron atoms are 5B10 , 80.1% are 5B11. The approximate atomic mass of boron is
(the response should be like 10.0 or 09.9)
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following pair are isobars?
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following pair are isobars?
| A. |
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| B. |
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| C. |
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| D. |
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What is the number of protons and neutrons respectively in ?
| A. |
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| B. |
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| C. |
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| D. |
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The atomic number of an element X is 92, if it is isobaric to then, the number of neutrons present in X is
| A. |
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| B. |
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| C. |
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| D. |
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The increasing order (lowest first) for the value of e/m (charge / mass) for
| A. |
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| B. |
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| C. |
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| D. |
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If is atomic weight and
is the atomic number of an element , then
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following particles has more electrons than neutrons
| A. |
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| B. |
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| C. |
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| D. |
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The mass number of an anion, , is
. If there are ten electrons in the anion, the number of neutrons is the nucleus of its elemental form
will be
| A. |
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| B. |
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| C. |
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| D. |
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The charge of an electron is . The value of free charge on
ion will be ____$\times$1019C
| A. |
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| B. |
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| C. |
|
| D. |
|
Consider an imaginary ion The nucleus contains
more neutrons than the number of electrons in the ion. The value of
is __________. [ nearest integer]
| A. |
|
| B. |
|
| C. |
|
| D. |
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Atomic mass number depends upon:
| A. |
|
| B. |
|
| C. |
|
| D. |
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How many naturally occurring isotopes of oxygen are there?
| A. |
|
| B. |
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| C. |
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| D. |
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What is the number of Protons and Neutrons respectively in $B r_{35}^{80}$?
| A. |
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| B. |
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| C. |
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| D. |
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If the de Broglie wavelength of the electron in nth Bohr orbit in a hydrogenic atom is equal to (a0 is Bohr radius), then the value of n/Z is :
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following emits - particles due to radioactivity?
| A. |
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| B. |
|
| C. |
|
| D. |
|
Choose the correct option :
(a) Antineutrino can be detected during the emission of :
(i) -rays (ii)
-particles (iii) Protons (iv) X-rays
(b) Which has magic number of neutrons :
(i) (ii)
(iii)
(iv)
(c) In this reaction predict the position of group of Po when lead is in the IVB group :
(i) (ii)
(iii)
(iv)
(d) Which of the following can show -radiations :
(i) (ii)
(iii) (iv)
| A. |
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| B. |
|
| C. |
|
| D. |
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Distance of closest approach of particle :
| A. |
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| B. |
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| C. |
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| D. |
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has 56 electrons, the atomic number of X is:
| A. |
|
| B. |
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| C. |
|
| D. |
|
Assertion: Isobars have the same atomic mass number but different atomic numbers.
Reasoning: Isobars have different numbers of neutrons.
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following pairs of atoms are isotopes of each other?
| A. |
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| B. |
|
| C. |
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| D. |
|
What is the binding energy of Li (in MeV) if the mass of proton, neutron and lithium nucleus is $1.0073 u, 1.0087 u$ and $7.036 u$, respectively?
| A. |
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| B. |
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| C. |
|
| D. |
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Which of the following atoms/ions contains 9 protons and 9 electrons
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following atom/ion contains 23 Nucleons (protons and neutrons)
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following is a pair of Isobars?
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following pair is of isobars
| A. |
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| B. |
|
| C. |
|
| D. |
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Which of the following sets contain isotopes?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Identify the pairs which are not of isotopes
(i) ${ }_6^{12} \mathrm{X},{ }_6^{13} \mathrm{Y}$
(ii) ${ }_{17}^{35} \mathrm{X},{ }_{17}^{37} \mathrm{Y}$
(iii) ${ }^{14} \mathrm{X},{ }_7^{14} \mathrm{Y}$
(iv) ${ }_4^8 \mathrm{X},{ }_5^8 \mathrm{Y}$
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Isobars are the atoms
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Chlorine exists in two isotopic forms, Cl-37 and Cl-35, but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately
| A. |
|
| B. |
|
| C. |
|
| D. |
|
CO is isoelectronic with
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Identify the pairs which are not of isotopes?
i) ${ }_6^{12} \mathrm{X},{ }_6^{13} \mathrm{Y}$
ii) ${ }_{17}^{35} \mathrm{X},{ }_{17}^{37} \mathrm{Y}$
iii) ${ }_6^{14} \mathrm{X},{ }_7^{14} \mathrm{Y}$
iv) ${ }_4^8 \mathrm{X},{ }_5^8 \mathrm{Y}$
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The ration of charge and mass would be greater for
| A. |
|
| B. |
|
| C. |
|
| D. |
|
A nucleous X captures a$\beta$ particle and then emits a neutron and $\gamma$ ray to form Y. X and Y are:
(A) Isomorphs
(B) Isotopes
(C) Isobars
(D) Isotones
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Chlorine has two naturally occurring isotopes, 35Cl and 37Cl. If the atomic mass of Cl is
35.45, the ratio of natural abundance of 35Cl and 37Cl is closest to
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The isoelectronic pair is:
| A. |
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| B. |
|
| C. |
|
| D. |
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The pair of atoms having the same number of neutrons is
| A. |
|
| B. |
|
| C. |
|
| D. |
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Two atoms are said to be isobars if
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Calculate $\mathrm{a}+\mathrm{b}+\mathrm{c}$ for $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$ where a is number of $\sigma$ bonds, b is number of $\pi$ bonds and $c$ is number of lone pairs
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Calculate $\mathrm{a}+\mathrm{b}+\mathrm{c}$ for $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$ where a is number of $\sigma$ bonds, b is number of $\pi$ bonds and $c$ is number of lone pairs
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In the nuclear reaction ${ }_{90}^{234} \mathrm{Th} \rightarrow{ }_{91}^{234} \mathrm{~Pa}+\mathrm{X}, \mathrm{x}$ is
| A. |
|
| B. |
|
| C. |
|
| D. |
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In the radioactive disintegration series ${ }_{90}^{232} \mathrm{Th} \rightarrow{ }_{82}^{208} \mathrm{~Pb}$, involving $\alpha$ and $\beta$ decay , the total number of $\beta$ particles emitted are
| A. |
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| B. |
|
| C. |
|
| D. |
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The number of electrons plus neutrons in ${ }_{19}^{40} \mathrm{~K}^{+}$ is:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The presence of positive charge on the nucleus is due to the protons in the nucleus.
-
- Atomic Models
- Developments leading to the Bohr’s model of atom
- Particle Nature of electromagnetic radiation
- Photoelectric Effect
- Line Spectrum of hydrogen
- Bohr model for hydrogen atom
- Dual behavior of matter
- Heisenberg’s uncertainty principle
- Elementary ideas of quantum mechanics
- Quantum mechanical model of atom
- Quantum Numbers (Concept)
- Shape of Orbitals (Concept)
- Radial nodes and planar nodes (Concept)
- Aufbau Principle, Pauli Exclusion Principle and Hund's Rule of Maximum Multiplicity (Concept)
- Electronic configuration of any element (Concept)
- Stability of Completely filled and Half-filled Subshells (Concept)
