A sample of iron contains three different isotopes and has a relative atomic mass，$$$A_{\mathrm{r}}$$$ ，of 55．8． The atomic radius of iron is $$$1.26 \times 10^{-10} \mathrm{~m}$$$. Suggest the change to the radius, if any, after an iron atom reacts to produce an $$$\mathrm{Fe}^{3+}$$$ ion. Explain your answer. . . .

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s25_qp_22 Year：2025 Question No：2(e)

Answer:

Knowledge points:

1.1.1 understand that atoms are mostly empty space surrounding a very small, dense nucleus that contains protons and neutrons; electrons are found in shells in the empty space around the nucleus

1.1.2 identify and describe protons, neutrons and electrons in terms of their relative charges and relative masses

1.1.3 understand the terms atomic and proton number; mass and nucleon number

1.1.4 describe the distribution of mass and charge within an atom

1.1.5 describe the behaviour of beams of protons, neutrons and electrons moving at the same velocity in an electric field

1.1.6 determine the numbers of protons, neutrons and electrons present in both atoms and ions given atomic or proton number, mass or nucleon number and charge

1.1.7 state and explain qualitatively the variations in atomic radius and ionic radius across a period and down a group

Answer:

Knowledge points:

Solution:

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