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Semenov [28]
3 years ago
6

I need the answer for the first question 1.

Chemistry
1 answer:
sp2606 [1]3 years ago
4 0

metal salt acid hydroyon and why cuz I guessed and I haven't t learned this yet and I need points

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Describe how elements are laid out on the periodic table of elements.
defon

Answer:

The chemical elements are arranged in order of increasing atomic number.

Explanation:

Hydrogen = 1

Helium = 2

Lithium = 3

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12<br> -4<br> si<br> -8<br> -4<br> 0<br> 4<br> 8<br> -4
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Which scientist is credited with developing the first scientific atomic theory?
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Answer:John Dalton

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A vehicle travels 60. km north and then 40. km south. What is its total displacements?
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Plutonium−239 (t1/2 = 2.41 × 104 yr) represents a serious nuclear waste hazard. if seven half-lives are required to reach a tole
sashaice [31]
The half-life of Plutonium−239, t1/2 is 2.41 × 10⁴<span> yrs

time taken to reach tolerable level = seven half-lives
                                                      = 7 x t1/2
                                                      = 7 x </span>2.41 × 10⁴ yrs
                                                      = 168700 yrs
                                                      = 1.687 x 10⁵ yrs

Hence, the period of time that <span>Plutonium-239 must be stored is </span>1.687 x 10⁵ years.
3 0
3 years ago
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