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Chemistry · May / June 2020 · Paper 41 · Question 1

0620

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This question is about elements X, Y and Z. 34

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  • 1(a)(i)[2]

    protons

    neutrons

  • 1(a)(ii)[1]

    nucleon number

  • 1(a)(iii)[1]

    34

  • 1(a)(iv)[1]

    2 : 8 : 8

  • 1(a)(v)[1]

    Al2X3

  • 1(b)(i)[1]

    isotopes

  • 1(b)(ii)[1]

    12C

  • 1(b)(iii)[1]

    a mole

  • 1(b)(iv)[1]

    Avogadro constant

  • 1(c)[3]

    M1 (3 × 69) + (2 × 71)

    349

    M2

    69.8

    5

    M3 Y = Ga / gallium

  • 1(d)(i)[1]

    phosphorus / P

  • 1(d)(ii)[2]

    gains electrons

    three electrons (when forming ion)

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