## Chemistry (4th Edition)

(a) X = $^{23}_{11}Na$ (b) X = $^1_1H$ (c) X = $^1_0n$ (d) X = $^{56}_{26}Fe$ (e) X = $^{0}_{-1}\beta$
1. Find the atomic number of X: (a) 12 + 1 = 2 + x x = 11 X = Na (b) 27 + 1 = 27 + x x = 1 X = H (c) 92 + 0 = 36 + 56 + 3x 3x = 0 x = 0 X = n (d) 24 + 2 = 0 + x x = 26 X = Fe (e) 8 = 9 + x x = -1 X = $\beta$ 2. Find the atomic mass of X: (a) 26 + 1 = 4 + x x = 23 (b) 59 + 2 = 60 + x x = 1 (c) 235 + 1 = 94 + 139 + 3x 3x =3 x = 1 (d) 53 + 4 = 1 + x x = 56 (e) 20 = 20 + x x = 0