Write the symbol of chromium.

Important Questions on Atoms and Molecules

EASY

Science>Chemistry>Atoms and Molecules>Atom

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

MEDIUM

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The graph of $\ln \left(\frac{R}{R_0}\right)$ versus $\ln A$ ($R=$radius of a nucleus and $A=$mass number) is

HARD

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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 $54 \mathrm{eV}?$ (Take mass of $\mathrm{He}$ atoms to be $7500$ times the mass of electrons)

MEDIUM

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The atomic number of element having symbol $\mathrm{Unt}$ is

EASY

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Symbol of iodine is:

EASY

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The symbol of copper is

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 
 

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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Who was the first scientist to use the symbols for elements in a very specific sense?

EASY

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Symbol of aluminium is:

EASY

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Symbol of calcium is:

EASY

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Symbol of gold is:

EASY

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Symbol of carbon is:

EASY

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Symbol for the Gold is?

EASY

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Symbol of silver is:

EASY

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Write down the names of compounds represented by the formulae ${\mathrm{K}}_2\mathrm{S}{\mathrm{O}}_4$.

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

$\mathrm{Ca}$ is the symbol of: