Tag: fundamental particles of an atom

Questions Related to fundamental particles of an atom

Total number of electrons present in $14\ gm$ of nitrogen gas is:

$[N _A = 6\times 10^{23}]$

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

$6\times { 10 }^{ 23 }$
$4.2\times { 10 }^{ 24 }$
$3\times { 10 }^{ 23 }$
$4.2\times { 10 }^{ 23 }$

The ratio between the number of neutrons present in $C^{12}$ and $Si^{30}$ atoms is:

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

3:8
2:5
3:7
1:1

The number of electrons present in $3\mathrm { d }$ of $\mathrm { Cu } $ is :

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

$20$
$10$
$16$
$24$

The number of electrons having $n+s=2.5$ in sulphide ion is :-

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

$3$
$4$
$6$
$8$

The approximate atomic weight of electron or positron per mol is:

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

$5.48\times 10^{-6} g mol^{-1}$
$ 5.48\times 10^{-8} g mol^{-1}$
$5.48\times 10^{-4} g mol^{-1}$
None of these

Rest mass of an electron is $9.11\times 10^{-31}$ kg. Molar mass of the electron is:

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

$1.50\times 10^{-31}kg$ $mol^{-1}$
$9.11\times 10^{-31}kg$ $mol^{-1}$
$5.5\times 10^{-7}kg$ $mol^{-1}$
$6.02\times 10^{23}kg$ $mol^{-1}$

State true or false.

Mass of $1$ mole of electrons is $5.48\times 10^{-7}$ kg/mol.

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

True
False

What are nucleons?

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

the sum of protons and neutrons present in the nucleus.
the number of protons in the nucleus.
the number of neutrons in the nucleus.
the sum of protons, neutrons and electrons present in the nucleus.

Find the mass number of sodium having $12$ neutrons.

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

$22$
$23$
$11$
$12$

The number of protons is equal to ________ in a neutral atom.

chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

atomic weight
atomic number
number of electrons
both B and C