Alpha Decay

Q.

Thorium with atomic number 92 and mass number 238 disintegrates to give Pb with atomic number 82 and mass number 206. How many alpha and beta particles are emitted during this process?

1. 7 and 8

2. 6 and 7

3. 7 and 6

4. 9 and 6

Q. A single electron in an ion has an ionization energy equal to 217.6 eV. What is the total number of neutrons present in one such ion?

1. 2
2. 4
3. 5
4. 9

Q.

Calculate the total number of α- and β-particles emitted in the nuclear reaction ${}_{92}{U}^{238}{⟶}_{82}P{b}^{214}.$

(IIT-JEE, 2009)

1. 4
2. 6
3. 8
4. 9

Q.

$T{h}^{234}$ disintegrates and emits 6β- and 7α-particles to form a stable element. Find the atomic number and mass number of the stable product. Also identify the element.
(IIT-JEE, 2004)

1. ${}_{80}P{b}^{204}.$
2. ${}_{82}P{b}^{204}.$
3. ${}_{80}H{g}^{202}.$
4. ${}_{82}P{b}^{206}.$

Q.

Calculate the number of α- and β-particles emitted when ${}_{92}{U}^{238}$ changes into radioactive ${}_{82}P{b}^{206}.$
(IIT-JEE, 2000)

1. 3, 4
2. 6, 8
3. 4, 3
4. 8, 6

Q.

Calculate the total number of α- and β-particles emitted in the nuclear reaction ${}_{92}{U}^{238}{⟶}_{82}P{b}^{214}.$

(IIT-JEE, 2009)

1. 4
2. 6
3. 8
4. 9

Q. The element Lawrencium ${(}_{103}^{256}Lr)$ is named after Ernest Lawrence, whose invention - the cyclotron - helped discover many radioactive nuclei. Consider now, the alpha decay of ${}_{103}^{256}Lr$.
${}_{103}^{256}Lr{\to }_b^{a}Md+\alpha$
Where $\alpha$ represents the alpha particle given out. What are the values of a and b?

1. a=252 ; b =105
2. a=252 ; b =101
3. a=260 ; b =101
4. a=260 ; b =105

Q. ${}_{84}P{o}^{210}$ (half-life= 138.4 days) undergoes $\alpha$- decay to form ${}_{82}P{b}^{206}$. If 2.1 g of ${}_{84}P{o}^{210}$ is placed in a sealed tube, what volume (in mL) of helium will accumulate in 69.2 days at STP?(take $\sqrt{2}$=1.4).