Some Important Atomic Terms

Which of the following is isoelectronic?

Set of isoelectronic species is

The ion that is isoelectronic with CO is

From the following pairs of ions which one is not an iso-electronic pair?

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?

$\mathrm{B}{\mathrm{e}}^{2+}$ is isoelectronic with which of the following ions?

$\mathrm{B}{\mathrm{e}}^{2+}$ is isoelectronic with which of the following ions?

An element A decays into an element $\mathrm{C}$ by a two-step process: $\mathrm{A}\to \mathrm{B}+{\mathrm{He}}_2^4$ and $\mathrm{B}\to \mathrm{C}+2{\mathrm{e}}^{-}$ Then -

If mass of neutron becomes double and mass of electron becomes half of it then calculate new mass of ${}_6\mathrm{C}^{12}$ atom and calculate the percentage rise in mass :

Which of the following statement is not correct :

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

Among the following groupings which represents the collection of isoelectronic species?

Deuterium nucleus contains

The electronic configuration of a dipositive metal ion ${\mathrm{M}}^{2+}$ is $2, 8, 14$ and its ionic weight is $58 \mathrm{a}.\mathrm{m}.\mathrm{u}.$. The number of neutrons in its nucleus would be _____.

In ${}_7{}^{14}\mathrm{N}$ if mass attributed to electrons were doubled and the mass attributed to protons were halved, the atomic mass would become approximately :-

An isotone of ${}_{32}{}^{76}\mathrm{Ge}$ is:
(i) ${}_{32}{}^{77}\mathrm{Ge}$
(ii) ${}_{33}{}^{77}\mathrm{As}$
(iii) ${}_{34}{}^{77}\mathrm{Se}$
(iv) ${}_{34}{}^{78}\mathrm{Se}$

In an atom ${}_{13}{}^{27}\mathrm{Al}$, number of proton is ($\mathrm{a}$), electron is ($\mathrm{b}$) and neutron is ($\mathrm{c}$). Hence ratio will be [in order $\mathrm{c}:\mathrm{b}:\mathrm{a}$]:-