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goldfiish [28.3K]
3 years ago
15

Which statement explains how the periodic table is arranged?. . A.. The periodic table is arranged by the radioactivity levels i

n unstable nuclei of elements.. . B.. The periodic table is arranged by the outermost electrons of the elements.. . C.. The periodic table is arranged by increasing atomic mass.. . D.. The periodic table is arranged by number of neutrons found within the most common isotopes.
Chemistry
2 answers:
rodikova [14]3 years ago
8 0
The periodic table is aranged by increasing atomic mass

vova2212 [387]3 years ago
7 0
The periodic table is arranged by the outermost electrons of the elements and this is the statement among the given statements that explains how the periodic table is arranged. The correct option among all the options that are given in the question is the second option or option "B".
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What are the elements in the first period
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Answer:

Explanation:

There are only two elements in the first period: hydrogen and helium. We can explain why there is less elements in the first row in modern theories of atomic structure.

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a glass container was initially charged with 1.50 mol of a gas sample at 3.75 atm and 21.7C. some of the gas was release as the
butalik [34]

Answer:

0.39 mol

Explanation:

Considering the ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

At same volume, for two situations, the above equation can be written as:-

\frac {{n_1}\times {T_1}}{P_1}=\frac {{n_2}\times {T_2}}{P_2}

Given ,  

n₁ = 1.50 mol

n₂ = ?

P₁ = 3.75 atm

P₂ = 0.998 atm

T₁ = 21.7  ºC

T₂ = 28.1 ºC

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T₁ = (21.7 + 273.15) K = 294.85 K  

T₂ = (28.1 + 273.15) K = 301.25 K  

Using above equation as:

\frac{{n_1}\times {T_1}}{P_1}=\frac{{n_2}\times {T_2}}{P_2}

\frac{{1.50\ mol}\times {294.85\ K }}{3.75\ atm}=\frac{{n_2}\times {301.25\ K  }}{0.998\ atm}

n_2=\frac{{1.50}\times {294.85}\times 0.998}{3.75\times 301.25}\ mol

Solving for n₂ , we get:

n₂ = 0.39 mol

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The source of alpha particles in a smoke detector is the Americium.

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What is it called when particles travel from an area of high consentration to an area of low consentration?
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If it isn't using energy, it's called diffusion
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The correct symbol is N
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