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3 years ago

Bohr models notes The number of periods shows you the number of _______

Chemistry

1 answer:

lorasvet [3.4K]3 years ago

8 0

Answer:

The number of periods shows you the number of _______

Electron Shell

Explanation:

Modern periodic table is divided into Groups and Periods.

A period is the horizontal row of the periodic table. There are seven periods in the periodic table.

It describes the following :

The period in which a particular element found will show its electron shell

The first period has Hydrogen and Helium = 1 - shell

The second Period has Lithium to neon = 2- shells

A group is the vertical column of the periodic table . There are 18 groups in total.

It describes the following :

The group number of the element is same as the number of electrons in the outermost shell.

The element having group 1 has = 1 electron in outer shell (example Na, K)

The element having group 2 has = 2 electron in outer shell (example Ca, Mg)

The element having group 0 has = full outer shell (example Ne Xe). these are also known as noble gases

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3.8 x 1 / 1

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600 s after initiation of a first order reaction 48.5% of the initial reactant concentration remains present. What is the rate c

Ludmilka [50]

Answer:

$k=1.20x10^{-3} s^{-1}$

Explanation:

For a first order reaction the rate law is:

$v=\frac{-d[A]}{[A]}=k[A]$

Integranting both sides of the equation we get:

$\int\limits^a_b {\frac{d[A]}{[A]}} \, dx =-k\int\limits^t_0 {} \, dt$

where "a" stands for [A] (molar concentration of a given reagent) and "b" is {A]0 (initial molar concentration of a given reagent), "t" is the time in seconds.

From that integral we get the integrated rate law:

$ln\frac{[A]}{[A]_{0} } =-kt$

$[A]=[A]_{0}e^{-kt}$

$ln[A]=ln[A]_{0} -kt$

$k=\frac{ln[A]_{0}-ln[A]}{t}$

therefore k is

$k=\frac{ln1-ln0,485}{600}=1,20x10^{-3}$

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3 years ago

Qual é a etapa onde ocorre a adição de cloro para eliminação de microorganismos patogênicos? AULA DE CIÊNCIAS 6° ano

-BARSIC- [3]

Answer:

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Explanation:

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melomori [17]

Answer:

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3 years ago

How many molecules (not moles of nh3 are produced from 5.01×10?4 g of h2?

Irina-Kira [14]

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