An unstable isotope of strontium has a half-life of 28.8 years. It is a beta-minus ( $β−\beta^-$ ) emitter and can be represented by this symbol:

^{90}_{38}\text{Sr}

What is the proton (atomic) number of this isotope?

Explain the meaning of the term half-life.

If a person ingests food or water contaminated with strontium-90, it is absorbed by the body and concentrates in bone tissue because it behaves chemically like calcium. Explain why strontium-90 inside bone tissue is a serious health hazard.

When a strontium-90 nucleus emits a $β−\beta^-$ . particle, it decays to form yttrium-90 (Y). Fill in the missing numbers $a$ , $b$ , $c$ , and $d$ to complete the nuclear decay equation:

^{90}_{38}\text{Sr} \rightarrow \> ^{a}_{b}\text{Y} + \> ^{c}_{d}\beta^-

Strontium-90 and yttrium-90 can both be described as isotopes, even though they have different numbers of protons. Explain why.

An unstable isotope of strontium has a half-life of 28.8 years. It is a beta-minus ( $β−\beta^-$ ) emitter and can be represented by this symbol:

^{90}_{38}\text{Sr}

What is the proton (atomic) number of this isotope?

Explain the meaning of the term half-life.

When a strontium-90 nucleus emits a $β−\beta^-$ . particle, it decays to form yttrium-90 (Y). Fill in the missing numbers $a$ , $b$ , $c$ , and $d$ to complete the nuclear decay equation:

^{90}_{38}\text{Sr} \rightarrow \> ^{a}_{b}\text{Y} + \> ^{c}_{d}\beta^-

Strontium-90 and yttrium-90 can both be described as isotopes, even though they have different numbers of protons. Explain why.

Radioactivity

Question 32

Markscheme

Radioactivity

Question 32

Markscheme

Radioactivity

Question 32

Radioactivity Questions

Radioactivity

Question 32

Radioactivity Questions