NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Medium

1 of 1

Analyzing +4 | -1

Assertion (A) : Element formed by the successive emission of

1 \alpha

-particle and

2 \beta

-particles is placed in the same group as the parent element.

Reason (R):

\alpha

-particle is

\left[{ }_2^4 \mathrm{He}\right]^{2+}

while

\beta

-particle is

{ }_{-1}^0 e

View answer and explanation

Correct option: B

Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

Option B (Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

.) is correct because the position in the periodic table depends on the atomic number and the electronic configuration, not directly on the nature of alpha and beta particles.

More Questions from STRUCTURE OF ATOM

Practice All Chapter MCQs →

Which of the following pairs have identical values of e/m? The correct de Broglie relationship is: Assertion: Unlike sound waves, electromagnetic waves do not require medium and can move in vacuum.

Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The

{p}_{{x}}

orbital has maximum electron density along the y axis and its nodal plane is xz plane.

S-II : For a given atom, for all values of

n

, the

{p}

-orbitals have the same shape, but the overall size decreases as '

n

' increases. S-I: Elements like

Rb, Cs, Tl, In, Ga

and

Sc

were discovered when their minerals were analysed by spectroscopic methods.

S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?