(a) List two properties of alpha particles. (b) X is an element which exists as an isotopic mixture containing 90% of \(^{39}_{19} X\) and 10% of \(^{41}_{1...
Question 1 Report
(a) List two properties of alpha particles.
(b) X is an element which exists as an isotopic mixture containing 90% of \(^{39}_{19} X\) and 10% of \(^{41}_{19}X\).
(i) How many neutrons are present in the isotope \(^{41}_{19}X\)?
(ii) Calculate the mean relative atomic mass of X.
Answer Details
(a) Two properties of alpha particles: they are positively charged (each is a helium nucleus, He2+); they have low penetrating power (stopped by paper or the skin). (They are also relatively heavy and cause intense ionization.)
(b)(i) Neutrons in 4119X = mass number - atomic number = 41 - 19 = 22 neutrons.
(ii) Mean relative atomic mass
\[ \bar{A}=\frac{(90\times39)+(10\times41)}{100}=\frac{3510+410}{100}=39.2 \]Download The App On Google Playstore
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