What is an atomic model? 

Important Questions on Structure of the Atom

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

The relation between the stopping potential $\left({\mathrm{V}}_0\right)$ and frequency $\left(\mathrm{v}\right)$ is correctly represented in [$\varphi =$ Work function]

HARD

Science>Chemistry>Structure of the Atom>Atomic Models

Consider a hypothetical case in which the charge of a proton is twice as that of an electron. Using this hypothetical case, how many protons $\left(\mathrm{P}\right),$ neutrons $\left(\mathrm{N}\right)$ and electrons $\left(\mathrm{E}\right)$ would a neutral ${}^{23}\mathrm{Na}$ atom contain?

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

The masses of an electron, a proton and a neutron respectively will be in the ratio

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

The nitride ion in lithium nitride is composed of

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

Which of the following conclusions could not be derived from Rutherford's $\alpha$-particle scattering experiment:

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

The correct increasing order of the electronegativity is

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

The number of protons, neutrons and electrons in ${}_6{}^{13}C$ respectively are

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

The introduction of a neutron into the nucleus of an atom would lead to a change in

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

An element with mass number $181$ contains $32\%$ more neutrons as compared to protons. What is the symbol of that element?

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

Isotopes are

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been:

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

Hydrogen has three isotopes $\left(\mathrm{A}\right), \left(\mathrm{B}\right)$ and $\left(\mathrm{C}\right).$ If the number of neutron(s) in $\left(A\right), \left(B\right)$ and $\left(\mathrm{C}\right)$ respectively, are $\left(\mathrm{x}\right), \left(\mathrm{y}\right)$ and $\left(\mathrm{z}\right),$ the sum of $\left(\mathrm{x}\right), \left(\mathrm{y}\right)$ and $\left(\mathrm{z}\right)$ is

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

The number of protons, neutrons and electrons in ${}_{71}^{175}\mathrm{Lu}$, respectively, are

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

The sum of the total number of neutrons present in protium, deuterium and tritium is

HARD

Science>Chemistry>Structure of the Atom>Atomic Models

An element with mass number $81$ contains $31.7\%$ more neutrons as compared to protons. Assign the atomic symbol.

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

The ratio between the neutrons in $\mathrm{C}$ and $\mathrm{Si}$ with respect to atomic masses 12 and 28 is-

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

${}_{19}{\text{K}}^{40}$ and ${}_{20}{\text{Ca}}^{40}$ are known as

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

$\mathrm{\alpha }$ -particles are projected towards the nuclei of the following metals, with the same kinetic energy. Towards, which metal, the distance of closest approach is minimum?

MEDIUM

Science>Chemistry>Structure of the Atom>Atomic Models

The radius of the atom is of the order of

EASY

Science>Chemistry>Structure of the Atom>Atomic Models

What is the ratio of mass of an electron to the mass of a proton