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aleksandr82 [10.1K]
3 years ago
14

Which needs two less valence electrons to complete an octet, X+2?

Chemistry
1 answer:
Vladimir79 [104]3 years ago
7 0

Answer:

The answer to your question is Ca

Explanation:

Ne  has its octet completed so, this option is wrong. Neon is stable.

C  Carbon has 4 valence electrons not 2, it should lose 4 electrons to complete an octet, so this option is wrong.

N  Nitrogen has 5 valence electrons not 2 , so it should gain 3 electrons to complete an octet.

Ca Calcium is the right answer it has to electrons in its outermost shell, it have to lose 2 electrons to complete an octet.

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Explanation :

First we have to calculate the concentration of O_2.

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C_{O_2} = concentration of O_2 = ?

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C_{O_2}=(1.28\times 10^{-3}mole/L.atm)\times (1.65atm)

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\text{Moles of }O_2=\text{Concentration of }O_2\times \text{volume of solution}

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\text{Mass of }O_2=\text{Moles of }O_2\times \text{Molar mass of }O_2

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astra-53 [7]

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