Solid, Liquid, Gas, and Plasma
Answer:
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Explanation:
T=2T
m=10 g
m=m₀2^(-t/T)
m₀=m/{2^(-2T/T)=m/2⁻²
m₀=10/2⁻²=40 g
40 grams
AN element is composed from atoms with the same number of protons,
A compound contain two or more different elements