Isotopes and relative atomic mass

Define isotopes as atoms of one element with different numbers of neutrons, explain why their physical properties differ slightly, and calculate a non-integer relative atomic mass from isotope masses and abundances, or an abundance from the relative atomic mass.

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Which property is the same for ammonia molecules containing deuterium, $\ce{ND3}$ , and ordinary ammonia molecules, $\ce{NH3}$ ? A. Molar mass B. Molecular geometry C. Density of the gas at STP D. Rate of diffusion

Naturally occurring gallium consists of two isotopes: 60 % of the atoms contain 38 neutrons and the remaining 40 % contain 40 neutrons. (i) Use section 7 of the data booklet to deduce the nuclear symbol of the heavier isotope. (ii) Calculate the relative…

Contrast the two isotopes in terms of atomic structure.

Calculate the relative atomic mass of chlorine from the sample, giving your answer to two decimal places.

At 25 °C the density of heavy water, $\ce{^{2}H2O(l)}$ , is $1.11\ \mathrm{g\,cm^{-3}}$ , while the density of ordinary water, $\ce{^{1}H2O(l)}$ , is $1.00\ \mathrm{g\,cm^{-3}}$ . Which statement explains this difference? A. Each $\ce{^{2}H}$ nucleus contains one…

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