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rusak2 [61]
3 years ago
8

ASAP in middle of test will mark brainLIEST Which family in the periodic table has metals that are usually harder than other met

als?
Alkali metals
Alkaline earth metals
Lanthanide series
Transition metals
Chemistry
1 answer:
GREYUIT [131]3 years ago
3 0
The correct answer is alkaline metals
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Using the exponential decay model; we calculate "k"
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A = A0 e^(k× 5050)
A/A0 = e^(5050k)
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In (0.5) = 5055k 
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To calculate how long it will take to decay to 86% of the original mass
0.86 = e^(-0.0001371t)
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