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Predicting products and reactants in nuclear reactions

Problem

start subscript, 85, end subscript, start superscript, 215, end superscript, start text, A, s, end text, start subscript, start color gray, left parenthesis, start text, a, s, t, a, t, i, n, e, end text, right parenthesis, end color gray, end subscript, right arrow, space, start box, question mark, end box, space, plus, start subscript, 2, end subscript, start superscript, 4, end superscript, start text, H, e, end text, start subscript, start color gray, left parenthesis, alpha, space, start text, p, a, r, t, i, c, l, e, end text, right parenthesis, end color gray, end subscript, plus, gamma, start subscript, start color gray, left parenthesis, start text, e, n, e, r, g, y, end text, right parenthesis, end color gray, end subscript
What is the daughter nuclide when astatine-215 undergoes alpha decay?
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