Science>Chemistry>Atoms and Molecules>Atom

MEDIUM

Earn 100

The atomic number of element having symbol $Unt$ is

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Important Questions on Atoms and Molecules

HARD

Science>Chemistry>Atoms and Molecules>Atom

In a Davisson-Germer experiment, Helium atoms were used in place of electrons. What should be the energy of Helium so that a strong peak of scattered He appears at an angle of

50 °,

as was the case with electrons having an energy of

54 eV ?

(Take mass of

He

atoms to be

7500

times the mass of electrons)

MEDIUM

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The graph of

\ln (\frac{R}{R_{0}})

versus

\ln A

(

R =

radius of a nucleus and

A =

mass number) is

EASY

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The mass number and the volume of a nucleus is

M

and

V

respectively. If the mass number is increased to

2 M

then the volume is changed to

EASY

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Which of the following symbols of elements are incorrect? Give their correct symbols
(a) Cobalt            CO
(b) Carbon            c
(c) Aluminium        AL
(d) Helium            He
(e) Sodium            So

EASY

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The symbol of copper is

EASY

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Symbol of iodine is:

EASY

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Symbol for the element Iron is?

MEDIUM

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Define the term symbol of an element. Why are Dalton's symbols not used in chemistry?

EASY

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Symbol of the element Chlorine is?

EASY

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Symbol of aluminium is:

EASY

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Symbol of silver is:

EASY

Science>Chemistry>Atoms and Molecules>Atom

Symbol of calcium is:

EASY

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Symbol of gold is:

EASY

Science>Chemistry>Atoms and Molecules>Atom

Symbol of carbon is:

EASY

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The names of the element are approved by:

EASY

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Write down the names of compounds represented by the formulae

K_{2} S O_{4}

.

EASY

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Symbol of chlorine is:

EASY

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Symbol of iron is:

EASY

Science>Chemistry>Atoms and Molecules>Atom

Ca

is the symbol of:

EASY

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Symbol for the Gold is?