atoms of same elements having different mass number

atoms of different elements having same mass number

atoms of same elements having same mass number

atoms of different elements having same number of neutrons

EASY

Earn 100

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because

50% studentsanswered this correctly

Important Questions on Atomic Structure

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

In the nuclear reaction

{}_{13}{Al}^{27} + {}_{2}{He}^{4} ⟶ {}_{14}X^{30} + {}_{1}H^{1}, X

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Hydrogen has three isotopes

(A), (B)

and

(C) .

If the number of neutron(s) in

(A), (B)

and

(C)

respectively, are

(x), (y)

and

(z),

the sum of

(x), (y)

and

(z)

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

An element with mass number

181

contains

32 %

more neutrons as compared to protons. What is the symbol of that element?

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

A particular station of All India Radio, New Delhi, broadcasts on a frequency of

1, 368 kHz

(kilo Hertz). The wavelength of the electromagnetic radiation emitted by the transmitter is [speed of light,

c = 3.0 \times 10^{8} {ms}^{- 1}

]

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The correct increasing order of the electronegativity is

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The product obtained after a positron emission from

{}_{31}{Ga}^{68}

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The number of protons, neutrons and electrons in

_{71}^{175} Lu

, respectively, are

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Select the correct statements from the following :

A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is $9.10939 \times 10^{- 31} kg$ .
C. All the isotopes of a given element show same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.