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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Medium

1 of 1

Analyzing +4 | -1

In which one of the following pairs the two species are both isoelectronic and isotopic?
(Atomic numbers :

{Ca}=20, {Ar}=18, {~K}=19, {Mg}=12

,

{Fe}=26, {Na}=11

)

View answer and explanation

Correct option: B

{ }^{39} {~K}^{+}

and

{ }^{40} {~K}^{+}

Option B (

{ }^{39} {~K}^{+}

and

{ }^{40} {~K}^{+}

) is correct because both species have the same number of electrons (isoelectronic) and are isotopes of potassium (isotopic).

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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

{p}

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

n

' increases. S-I: Elements like

Rb, Cs, Tl, In, Ga

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?