Nucleus Common Terms

Q.

In three moles of ethane (C₂H₆), calculate the following:

(i) Number of moles of carbon atoms.

(ii) Number of moles of hydrogen atoms.

(iii) Number of molecules of ethane.

Q.

Which of the following are isoelectronic with one another

1. 

2. 

3. 

4. 

Q.

Calculate the total number of neutrons present in 1 mole of C-14.

Q. How many moles are there in 100 amu of He?

Q.

Which has bigger radius and why?

³⁵Cl^- or ³⁷Cl^-

Q. The least abundant isotope of hydrogen is

1. Protium
2. Both A & B
3. Deuterium
4. Tritium

Q.

An organic compound made of C, H and N contains 20% nitrogen. Its molecular weight will be:

1. $65$

2. $70$

3. $100$

4. $140$

Q.

Which of the following represents isotopes and which represents isobars ?

1. ${}_5{}^{10}\mathrm{B},{}_5{}^{11}\mathrm{B}$
2. ${}_{19}{}^{40}\mathrm{K},{}_{20}{}^{40}\mathrm{Ca}$
3. ${}_{92}{}^{235}\mathrm{U},{}_{92}{}^{238}\mathrm{U}$
4. ${}_{10}{}^{22}\mathrm{N}e,{}_{11}{}^{22}\mathrm{N}e$
5. ${}_1{}^3\mathrm{H},{}_2{}^3\mathrm{H}$
6. ${}_{14}{}^{28}\mathrm{Si},{}_{14}{}^{29}\mathrm{S}i$

Q. Nuclei with same number of protons but different number of neutrons are called ___.
Nuclei with same number of neutrons but different atomic number are called___.
Nuclei with same mass number are called___ respectively.

1. Isotopes, isotones, isobars
2. Isotones, isotopes, isobars
3. Isobars, isotopes, isotones
4. Isochores, isotones, isobars

Q.

calculate the number of electrons , protons and neutrons present in ClO^-3

Q.

How can we calculate the number of neutrons present in a particular atom??

Q. The value of A for a neutral atom is 25 and Z is 12; find the number of protons, neutrons and electrons in the atom.

1. 12, 25 and 25 respectively.
2. 12, 25 and 12 respectively.
3. 12, 13 and 12 respectively.
4. 25, 12 and 25 respectively.

Q. The most abundant elements by mass in the body of a healthy human adult are: Oxygen $\left(61.4\%\right)$, Carbon $\left(22.9\%\right)$, Hydrogen $\left(10.0\%\right)$ and Nitrogen $\left(2.6\%\right)$. The weight which a 75 kg person would gain if all $H^1$ atoms are replaced by $H^2$ atoms is:

1. 15 $kg$
2. 7.5 $kg$
3. 10 $kg$
4. 37.5 $kg$

Q. How many moles of electrones weigh one kilogram. Do it by unitary method .

Q. Nucleons are

1. Protons and electrons
2. Protons and neutrons
3. Electrons and neutrons
4. Electrons, protons and neutrons

Q. Nuclei with the same number of protons but different number of neutrons are called . Whereas, nuclei with the same mass number are called .

1. isobars
2. isotopes
3. isotones
4. isodiaphers

Q. An element consist of 15 protons and 16 neutrons. Mention the number of electrons, atomic number and mass number of this element.

Q. Positron has nearly the same weight as that of

1. $\alpha$ -particle
2. Proton
3. Neutron
4. Electron

Q. An isotope of $G{e}_{32}^{76}$ is :

1. $Element{X}_{32}^{77}$
2. $Element{X}_{33}^{71}$
3. $Element{X}_{34}^{77}$
4. $Element{X}_{34}^{78}$

Q. ​Which of the given relations about the below elements are correct.

$a{)}^{12}Cb{)}^{14}Cc{)}^{14}Nd{)}^{16}O$

1. a and b are isotopes
2. b and c are isobars
3. b and d are isotones
4. c and d are isobars

Q. Positron has nearly the same weight as that of

1. $\alpha$ -particle
2. Electron
3. Proton
4. Neutron

Q.
​Which of the given relations about the below elements are correct.

$a{)}^{12}Cb{)}^{14}Cc{)}^{14}Nd{)}^{16}O$

1. a and b are isotopes
2. b and c are isobars
3. b and d are isotones
4. c and d are isobars

Q. The value of A for a neutral atom is 25 and Z is 12; find the number of protons, neutrons and electrons in the atom.

1. 12, 25 and 12 respectively.
2. 25, 12 and 25 respectively.
3. 12, 13 and 12 respectively.
4. 12, 25 and 25 respectively.

Q.

Complete the following table.

ELEMENT	$\mathrm{n}$	$\mathrm{p}$	$\mathrm{e}$	MASS NUMBER	ATOMIC NUMBER
$\mathrm{Be}$	_	4	_	9	_
$\mathrm{Mg}$	12	_	12	_	_
$\mathrm{Si}$	14	_	_	_	14
$\mathrm{P}$	_	15	_	31	_

Q.

Hydrogen atom does not have _______(protons/ neutrons).

Q. Positronium is the name given to an atom-like combination formed between

1. A positron and a proton
2. A positron and a neutron
3. A positron and $\alpha$-particle
4. A positron and an electron

Q. How many neutrons r present in 90 g of water??

Q. In the future you synthesize 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. ${}_2^{4}X$
2. ${}_4^{2}X$
3. ${}_4^{6}X$
4. ${}_4^{4}X$

Q. Elements having different nuclear charge but the same mass number are called:

1. Isotopes
2. Isobars
3. Isomers
4. Isotones

Q. In the future you synthesize 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. ${}_4^{2}X$
2. ${}_4^{6}X$
3. ${}_4^{4}X$
4. ${}_2^{4}X$