The elements are arranged by atomic mass. Before, they were arranged by atomic mass.
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Answer:
(1) Z = 82, M = 208; (2) Z = 82, M = 208
Step-by-step explanation:
(1) Decay of Th-232
The unbalanced nuclear equation is
The main point to remember in balancing nuclear equations is that the <em>sums of the superscripts and the subscripts must be the same on each side</em> of the equation.
Then
90 = x + 6×2 + 4(-1), so x = 90 – 12 + 4 = 82
232 = y + 6×4 + 4×0, so y = 232 – 24 = 208
Z = 82, M = 208
(2) Decay of U-238
The unbalanced nuclear equation is
Then
92 = x + 6×2 + 2(-1), so x = 92 – 12 + 2 = 82
238 = y + 6×4 +4×0, so y = 238 – 24 = 214
Z = 82, M = 214
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Explanation:
Example: The two cars collided with an ear-splitting crash. to clash; conflict: Their views on the matter collided.