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Marina86 [1]
2 years ago
5

The valence electrons of a krypton (Kr) atom in the ground state are located in the

Chemistry
1 answer:
egoroff_w [7]2 years ago
6 0

Answer:

D

Explanation:

The valence electrons are the outer electrons and must be located in the outermost shell. In this case, D.

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An isotope of cesium-137 has a half-life of 30 years. If 5.0g of cesium-137 decays over 60 years. How many grams will remain.
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Answer:

1.25 gram of cesium-137 will remain.

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