The half life period of four isotopes is given below- i 7-6 years ii 4000 years iii 6000 years iv 3-2- 10 5 yearsWhich of the above isotopes is most stable-

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Standard XII

Physics

Beta Decay

The half life...

Question

The half life period of four isotopes is given below:
$(i)$ $7.6$ years
$(i i)$ $4000$ years
$(i i i)$ $6000$ years
$(i v)$ $3.2 \times 10^{5}$ years
Which of the above isotopes is most stable?

(i v)

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(i i i)

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(i i)

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(i)

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Solution

The correct option is A $(i v)$
The isotope which will exist for a longer period of time is more stable.
$∴$ The isotope (iv) is most stable since it has the maximum half-life $[3.2 \times 10^{5} y e a r s]$ in the given options.

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Question 16
Which of the following are the characteristics of isotopes of an element?

(i) Isotopes of an element have same atomic masses
(ii) Isotopes of an element have same atomic number
(iii) Isotopes of an element show same physical properties
(iv) Isotopes of an element show same chemical properties

(a) (i), (iii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

Q. From the following nuclei, select the pairs of isotopes.

(i)_{92}^{238} U (i i)_{90}^{234} T h (i i i)_{92}^{234} U (i v)_{91}^{234} P a

Q. Nucleus P is converted into S through the following reactions

P \to Q + α

Q \to R + e^{-}

R \to S + e^{-}

Now a student figures out 4 conclusions from the above reactions as given below.
(i)R and S are isotopes
(ii) P and S are isotopes
(iii) Q and S are isotopes
(iv) Q and R are isotopes

Which of the following are the correct characteristics of isotopes of an element?

(i) same atomic mass (ii) same atomic number

(iii) same physical properties (iv) same chemical properties

(a) (i), (ii) and (iv) (b) (ii), (iii) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)

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The half life period of four isotopes is given below:(i) 7.6 years(ii) 4000 years(iii) 6000 years(iv) 3.2×105 yearsWhich of the above isotopes is most stable?

The correct option is A (iv)The isotope which will exist for a longer period of time is more stable.∴ The isotope (iv) is most stable since it has the maximum half-life [3.2×105years] in the given options.

The half life period of four isotopes is given below:
$(i)$ $7.6$ years
$(i i)$ $4000$ years
$(i i i)$ $6000$ years
$(i v)$ $3.2 \times 10^{5}$ years
Which of the above isotopes is most stable?

The correct option is A $(i v)$
The isotope which will exist for a longer period of time is more stable.
$∴$ The isotope (iv) is most stable since it has the maximum half-life $[3.2 \times 10^{5} y e a r s]$ in the given options.