Chemistry · May / June 2026 · Paper 41 · Question 3
0620
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This question is about structure and bonding.
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3(a)(i)[3]
M1 magnesium ion 2,8 all crosses(1)
M2 both fluoride ions 2, 8
outer shell 7 dots and 1 cross(1)
M3 2+ on Mg and 1- on both F (1)
3(a)(ii)[2]
M1 strong forces of attraction / strong bonds(1)
M2 (between) oppositely charged ions
OR
(between) positive and negative ions
OR
(between) cations and anions
OR
(between) Mg2+ and F–(1)
3(a)(iii)[1]
Ions move (when molten not when solid)
3(b)(i)[2]
M1 one shared dot and cross(1)
M2 6 non-bonding dots on one fluorine atom and 6 non- bonding crosses on the other fluorine atom to complete both octets (1)
3(b)(ii)[2]
M1 solid(1)
M2 because –240 ° C is lower than the melting point / melting point is above –240 ° C (1)
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