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drek231 [11]
2 years ago
6

Which element has 4 energy levels and 7 valence electrons

Chemistry
1 answer:
antoniya [11.8K]2 years ago
5 0

Answer:

Beryllium 4 2

Boron 5 3

Carbon 6 4

Nitrogen 7 5

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Explanation:

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Neptunium-237 was the first isotope of a transuranium element to be discovered. the decay constant is /s. what is the half-life
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The half-life in years of Neptunium-237 which was the first isotope is 2.1 10^{6} years.

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2 years ago
5. A hollow glass sphere has a volume of 350 mL and
Rina8888 [55]

Explanation:

Given that,

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\text{specific gravity}=\dfrac{\text{density of substance}}{\text{density of water}}\\\\SG=\dfrac{m}{V\times \rho_w}\\\\m=SG\times V\times \rho_w\\\\m=1.252\times 350\ mL\times 1\ g/mL\\\\m=438.2\ \text{grams}

We know that,

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3 years ago
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7 0
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How many liters of carbon dioxide will be produced when 128 L of ethane are burned?
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