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drek231 [11]
3 years ago
9

Which of the following elements is very reactive and needs to gain one electron to have a full outermost shell?

Chemistry
2 answers:
natita [175]3 years ago
6 0

Answer:   Iodine

Explanation:  Cesium is the alkali metal which belongs to the group 1 of the periodic table.

Iodine is the Group 17 element which are known as the Halogens as they are the group of the most electronegative atoms.

Zinc belongs to the Transition metal d block .

Xenon belongs to the Group 18 of noble gases.

The electronic configuration will help us to determine which can gain electron to have a full outermost shell.

Cesium (Cs) = [Xe] 6s1

Zinc (Zn) = [Ar] 3d10 4s2

Iodine(I) =  [Kr] 4d10 5s2 5p5

Xenon (Xe) = Kr 4d10 5s2 5p6

Thus Iodine can easily gain one electron to have complete outermost shell.

NISA [10]3 years ago
4 0
Iodine has 7 valence electrons. It needs therefore only 1 electron to be stable this is why it is so reactive.
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The available energy decreases as one moves upward in an energy pyramid.

<h3>Energy pyramid</h3>

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2 years ago
Which of the following elements belong to the same pair?
butalik [34]

Answer:

B. Na and Li

Both are group I elements.

5 0
3 years ago
what would be the effect on the properties of the water molecule if oxygen and hydrogen had equal electronegativity?
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If an insect population increases and then decreases as the available supply of food changes, what does this demonstrate
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3 years ago
C(S)+O2(g)--&gt;CO2(g)
soldi70 [24.7K]

<u>Answer:</u> The correct answer is 1.18 g.

<u>Explanation:</u>

We are given a chemical equation:

C(S)+O2(g)\rightarrow CO_2(g)

We know that at STP conditions:

22.4L of volume is occupied by 1 mole of a gas.

So, 2.21L of carbon dioxide is occupied by = \frac{1}{22.4L}\times 2.21L=0.0986mol of carbon dioxide gas.

By Stoichiometry of the above reaction:

1 mole of carbon dioxide gas is produced by 1 mole of carbon

So, 0.0986 moles of carbon dioxide is produced by = \frac{1}{1}\times 0.0986=0.0986mol of carbon.

Now, to calculate the mass of carbon, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of carbon = 0.0986 mol

Molar mass of carbon = 12 g/mol

Putting values in above equation, we get:

0.0986mol=\frac{\text{Mass of carbon}}{12g/mol}\\\\\text{Mass of carbon}=1.18g

Hence, the correct answer is 1.18 g.

3 0
3 years ago
Read 2 more answers
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