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elena-14-01-66 [18.8K]
2 years ago
9

Which elements have electron configurations that end in ns2np5?

Chemistry
2 answers:
Dahasolnce [82]2 years ago
5 0

Explanation:

The given configuration is ns^{2}np^{5} and this shows that there are seven valence electrons present in the outermost shell. Therefore, it is a general configuration of group 17 which is also known as halogen group.

Elements of group 17 are fluorine, chlorine, bromine, iodine and astatine.

For example, fluorine is a group 17 element that has electronic configuration 1s^{2}2s^{2}2p^{5}.

Value of n will start from 2 and increases on moving down the group.

Hence, we can conclude that halogens are the elements that have electron configurations that end in ns^{2}np^{5}.

Arada [10]2 years ago
4 0
Last level of atoms of these elements has 2+5= 7 electrons. These elements are located in the 17th group of the Periodic Table, and they are called halogens.
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A strand of hair is approximately 50 μm thick. If the diameter of an atom is 1 × 10-10 m, how many atoms thick is a strand of ha
Kazeer [188]

Thickness of strand hair = 50 μm

Diameter of an atom  = 1 \times 10^{-10} m

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So, thickness of strand hair =50 μm= 50 \times 10^{-6} m

Therefore,

number of atoms thick is a strand of hair =  50 \times 10^{-6}m\times \frac{1 atom}{1 \times 10^{-10}m}

= 50\times 10^{4}atoms

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6 0
3 years ago
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The percent composition of carbon in C6H12O6 is:
nata0808 [166]
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Then multiply each by the number of atoms of each element in the formula (the number that comes after each element in the equation for example C6 means 6 carbon atoms.

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You want to know how many moles of gas your lungs can hold. You start off with a balloon that has 1.4 moles of gas and occupies
Mrrafil [7]

Number of moles : n₂ = 1.775 moles

<h3>Further explanation</h3>

Given

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Volume = V₁=22.4 L

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Solution

Avogadro's hypothesis, at the same temperature and pressure, the ratio of gas volume will be equal to the ratio of gas moles  

The ratio of gas volume will be equal to the ratio of gas moles

\tt \dfrac{V_1}{V_2}=\dfrac{n_1}{n_2}

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