Isobars and Isotopes

Q. The sum of the number of neutrons and protons in the isotopes of hydrogen is:

1. 6
2. 5
3. 4
4. 3

Q.

The protons and neutrons collectively present in the nucleus are called ________.

Q.

Deuterium is also called heavy hydrogen.

1. True
2. False

Q. An element is represented by ${}_Z{X}^A$, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isoelectronic: Species/ elements having same number of electron
Isodiaphers: Elements having same value of $|(A-2Z)|$
Isotopes: Atoms having same number of proton


Which of the following pairs of compounds is both isoelectronic and isotopic?

1. ${}_{11}^{24}Na,{}_{12}^{24}Mg$
2. ${}_{19}^{39}{K}^{+},{}_{19}^{40}{K}^{+}$
3. ${}_8^{16}{O}^{2-},{}_8^{17}O$
4. ${}_{12}^{24}M{g}^{2+},{}_{12}^{25}Mg$

Q. Among the following, the isoelectronic species is/are :
(i) $O^{2-},F^{-},N{a}^{+},M{g}^{2+}$
(ii) $N{a}^{+},M{g}^{+},A{l}^{3+},F^{-}$
(iii) $N^{3-},O^{2-},F^{-},Ne$

1. (i) & (ii)
2. (i) & (iii)
3. (ii) & (iii)
4. (i), (ii) & (iii)

Q. An element is represented by ${}_Z{X}^A$, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isoelectronic: Species/ elements having same number of electron
Isodiaphers: Elements having same value of $|(A-2Z)|$
Isotopes: Atoms having same number of proton

Which of the following is a pair of isodiaphers?

1. ${}_{19}^{39}Kand{}_9^{19}F$
2. ${}_6^{13}Cand{}_7^{14}N$
3. ${}_{92}^{238}Uand{}_{90}^{231}Th$
4. ${}_{52}^{130}Teand{}_{54}^{130}Xe$

Q.

Which of the following are isotones?

Q. Will the value of mass of elements in amu change on changing the the avogadro number?

Q. Which of the following is the isotone of ${}_{16}{S}^{32}$ ?

1. ${}_{15}{P}^{31}$
2. ${}_7{N}^{14}$
3. ${}_{18}A{r}^{40}$
4. ${}_{17}C{l}^{34}$

Q. 1.What is isodiaphers ? 2. What is zeeman effect

Q. The nuclei of which one of the following pairs of nuclei are isotones:

1. ${}_{42}{\text{Mo}}^{92}{,}_{40}{\text{Zr}}^{92}$
2. ${}_{20}{\text{Ca}}^{40}{,}_{16}{\text{S}}^{32}$
3. ${}_{34}{\text{Se}}^{74}{,}_{31}{\text{Ga}}^{71}$
4. ${}_{38}{\text{Sr}}^{84}{,}_{38}{\text{Sr}}^{86}$

Q.

Which of the following are isobars?

${}_{18}^{40}Ar$ ${}_6^{14}C$ ${}_{20}^{40}Ca$ ${}_7^{14}N$

1. [I, II] and [III, IV]

2. [I, III] and [II, IV]

3. [I, IV] and [II, III]

4. None of these

Q. Many elements have non-integral atomic masses because

1. They have isotopes
2. Their isotopes have non-integral masses
3. Their isotopes have different masses
4. None of these

Q. Isoelectronic species have same number of electrons.

1. True
2. False

Q. Which of the following pair is isodiapheres?

1. $C_6^{14}andN{a}_{11}^{23}$
2. $M{g}_{12}^{24}andN{a}_{11}^{23}$
3. $H{e}_2^{4}and{O}_8^{16}$
4. $C_6^{12}and{N}_7^{15}$

Q. Select the isodiaphers among the following pairs. (1)27Al & 31P (2)12C & 14C (3)30Si & 31P (4)14N & 18O

Q. Which oxide of N is isoelectronic with $C{O}_2$?

1. $N{O}_2$
2. $NO$
3. $N_{2}O$
4. $N_2{O}_3$

Q. Isotone of ${}_{32}^{76}Ge$ is/are:

1. ${}_{32}^{77}Ge$
2. ${}_{33}^{77}As$
3. ${}_{34}^{77}Se$
4. ${}_{34}^{78}Se$

Q. An element is represented by ${}_Z{X}^A$, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isoelectronic: Species/ elements having same number of electron
Isodiaphers: Elements having same value of $|(A-2Z)|$
Isotopes: Atoms having same number of proton


Which of the following species is isoelectronic with the hydride ion?

1. $L{i}^{+}$
2. $H{e}^{+}$
3. $L{i}^{2+}$
4. $B{e}^{+}$

Q. Which of the following pairs constitute isotones ?

1. ${}_6^{13}C$ and ${}_6^{14}C$
2. ${}_6^{13}C$ and ${}_7^{14}N$
3. ${}_7^{14}N$ and ${}_7^{15}N$
4. ${}_7^{14}N$ and ${}_9^{19}F$

Q. Which is the isotone of ${}_{32}^{76}Ge$ ?

1. ${}_{32}^{78}Ge$
2. ${}_{32}^{77}Ge$
3. ${}_{34}^{78}Se$
4. ${}_{36}^{79}Kr$