Nucleus: Common Terms

Q.

Nuclei with the same number of protons but a different number of neutrons are called isobars

Nuclei with the same number of neutrons but a different atomic number are called isotopes

Nuclei with the same mass number are called isotones

1. Isotones

2. Isotopes

Q.

What is the smallest subatomic particle?

Q.

An ion $X^{2+}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

1. Atomic number -18, Mass number - 40, Argon

2. Atomic number - 22, Mass number - 48, Titanium

3. Atomic number - 20, Mass number - 40, Calcium

4. Atomic number - 40, Mass number - 20, Calcium

Q. The approximate total mass of a sodium atom is

1. $23\text{a.m.u.}$
2. $11\text{a.m.u.}$
3. $12\text{a.m.u.}$

Q.

The chemical behaviour of an atom depends upon

1. the number of protons in its nucleus

2. the number of electrons orbiting around its nucleus

3. the number of nucleons in its nucleus.

4. the number of neutrons in its nucleus

Q. Two protons exerts a nuclear force on each other, the distance between them is

1. ${10}^{-12}m$
2. ${10}^{-14}m$
3. ${10}^{-10}m$
4. ${10}^{-8}m$

Q.

${}_{86}{}^{222}\mathrm{Rn}$ is an isotope of the noble gas radon.

How many protons, neutrons and electrons are present in one atom of the element?

Q.

On adding the number of protons and the number of neutrons in the nucleus of an atom, Sam got the ___ of the considered element.

1. atomic number

2. mass number

3. number of protons

4. number of nucleons

Q.

The atomic mass of most common isotope of carbon in ground state is:

1. equal to 12 u

2. less than 12 u

3. more than 12 u

4. Depends on the allotrope, whether it is graphite, charcoal or diamond.

Q.

During the emission of a beta particle, the quantity that remains the same is

1. Mass Number

2. Atomic Number

3. Number of Protons

4. Number of Neutrons

Q.

Answer the following question in short:

What are the characteristics of atoms of elements?

Q. The $\alpha$ -particle is the nucleus of --------- atom .

1. Neon
2. Deuterium
3. Helium
4. Hydrogen

Q.

Which of the following are true for an element?

(i) Atomic number= number of protons + number of electrons

(ii) Mass number= number of protons + number of neutrons

(iii) Atomic number= number of protons = number of neutrons

(iv) Atomic number= number of protons = number of electrons

1. (i) and (ii)

2. (i) and (iii)

3. (ii) and (iii)

4. (ii) and (iv)

Q.

An element X has mass number 23 and atomic number 11.

a) State the number of protons in its nucleus

b) State the number of neutrons in its nucleus

c) State the number of electrons revolving around the nucleus.

d) Draw the atomic structure.

Q.

The ion of an element has 3 positive charges. The mass number of the atom is 27 and the number of neutrons is 14. Then what is the number of electrons in the ion?

1. 13

2. 16

3. 10

4. 14

Q.

The inference/ inferences that you can get from the following atomic model:-

1. The mass number is 11

2. The atomic number is 23

3. It is represented as ${}_{11}^{23}Na$

4. The mass number is 23

Q.

Draw the geometric atomic structure of following element, showing clearly the {a} number of protons {b} number of electrons {c} number of neutrons.

${}_9{}^{}\mathrm{F}$¹⁹

Q.

What do you understand by atomic number and mass number?

Q.

The atomic numbers and mass numbers of X respectively ?
${}_{84}^{218}PO\to X{+}_2^{4}He$

1. 200, 80

2. 212, 82

3. 214, 82

4. 214, 80

Q.

$M_n$ and $M_p$ represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be

1. $M<[N{M}_n+Z{M}_p]$

2. $M>[N{M}_n+Z{M}_p]$

3. $M=[N{M}_n+Z{M}_p]$

4. $M=N[M_n+M_p]$

Q. The value of A for a neutral atom is 25 and Z is 12. Then, the number of protons and neutrons in the atom areand respectively.

1. $12$
2. $25$
3. $13$
4. $30$

Q.

The future you synthesizes a new element. A neutral atom of the element, say 'X', has 4 electrons and 2 neutrons. How will you represent the nucleus of the element in your award-winning paper?

1. 

2. 

3. 

4. 

Q. Two protons exerts a nuclear force on each other, the distance between them is

1. ${10}^{-14}m$
2. ${10}^{-10}m$
3. ${10}^{-12}m$
4. ${10}^{-8}m$

Q.

Two protons exert a nuclear force on each other, then what is the distance between them?

1. ${10}^{-14}m$

2. ${10}^{-10}m$

3. ${10}^{-12}m$

4. ${10}^{-8}m$

Q.

What is the absolute mass of a proton?

1. $9.1*{10}^{-27}kg$

2. $1.67*{10}^{-27}\mathrm{kg}$

3. $9.1*{10}^{-31}\mathrm{kg}$

4. $\mathrm{None}\mathrm{of}\mathrm{these}$

Q.

Draw the geometric atomic structure of ${}_2{}^4\mathrm{He}$ , showing clearly number of neutrons, number of protons and number of electrons.

Q.

Draw the geometric atomic structure of ${}_{12}{}^{24}\mathrm{Mg}$ , showing clearly number of neutrons, number of protons and number of electrons.

Q. If Avogadro's number is $6\times {10}^{23}$ then the number of protons, neutrons and electrons in 14 g of ${}_6{C}^{14}$ are respectively

1. $36\times {10}^{23},48\times {10}^{23},36\times {10}^{23}$
   
2. $36\times {10}^{23},36\times {10}^{23},36\times {10}^{21}$
3. $48\times {10}^{23},48\times {10}^{23},36\times {10}^{21}$
4. $48\times {10}^{23},36\times {10}^{23},48\times {10}^{21}$

Q.

Which of the following statement is always correct?

1. An atom has equal number of electrons and protons.

2. An atom has equal number of electrons and neutrons.

3. An atom has equal number of protons and neutrons.

4. An atom has equal number of electrons, protons and neutrons.

Q.

The ion of an element has 3 positive charges. The mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

1. 13

2. 10

3. 14

4. 16