A nucleus of strontium-90 is represented using nuclide notation as ⁹⁰₃₈Sr.
(a)(ii)Determine the number of electrons in one atom of strontium-90.
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Available practice: 46 of 80 marks. Parts 1(a)(iii), 2(a), 3(b), 5(b)(i), 5(b)(ii), 6(b)(i), 7(c)(ii), 8(a)(ii), 8(c), 9(b)(i), 9(b)(ii), 10(a)(i), 10(c) await marking support. Scores cover available parts only.
Strontium-90 decays by emitting β-particles (beta-particles).
(b)Describe the nature of β-particles.