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3 years ago

What is the valence number of an element that has 3 electron in its outermost shell?

1 answer:

5 0

Lithium has 3 electrons --- 2 in the first shell, and 1 in the second shell (so one valence electron). Beryllim has 4 electrons --- 2 in the first shell, and 2 in the second shell (so two valence electrons). Boron has 5 electrons --- 2 in the first shell, and 3 in the second shell (so three valence electrons).Jul 27, 2019
Hope that helps and may I get brainliest?

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En la electrólisis del Cloruro de plomo se han depositado 2.6 gramos del metal en 20 minutos el peso atómico del plomo es 206 ca

mart [117]

Answer:

2.01 A

Explanation:

Para esta pregunta debemos empezar por la semi-reaccion del plomo:

$Pb^+^2~_(_a_q_)~+~2e^-~->~Pb_(_s_)$

Se intercambian dos electrones en la semi-reacción del plomo. Si tenemos en cuenta la ecuación:

$n=\frac{I*t}{z*F}$

Donde:

n= Moles depositados 

I= Intensidad de corriente (en Amperios)

z= Numero de electrones intercambiados

F= Constante de faraday = 96484 C/mol

t=tiempo (en segundos)

Que conocemos de esta ecuación?

Los moles (se pueden calcular a partir de la masa atómica del plomo, 207.2 g/mol)

$2.6~g~Pb\frac{1~mol~Pb}{207.2~g~Pb}=0.0125~mol~Pb$

El tiempo (hay que convertirlo a segundos):

$20~min\frac{60~s}{1~min}=1200~s$

Z (Numero de electrones)

De acuerdo a la semi-reacción son intercambiados 2 electrones.

Por lo tanto podemos resolver para "I":

$I=\frac{n*z*F}{t}=\frac{0.0125~mol*2*96484\frac{C}{mol}}{1200~s}$

$I~=~2.01~\frac{C}{s}=2.01~A$

Espero que sea de ayuda!

6 0

3 years ago

Which is a cause of acid precipitation?

Leya [2.2K]

Answer:

Explanation:

7 0

3 years ago

Read 2 more answers

What type of reaction is _CaCO3 and H2

Anna [14]

Decomposition: A substance breaks down to smaller species.

8 0

3 years ago

Help

Nat2105 [25]

Answer:

commensalism

Explanation:

you had it right lol

8 0

3 years ago

Which has a greater surface tension: H20 or CH3CH2CH2CL? Explain

natali 33 [55]

Water will have higher surface tension.

Explanation:

There are strong hydrogen bonds and strong intermolecular forces present in water. Water is polar in nature that is why surface tension is present in it. The force of attraction between the particles is the main factor for surface tension.

The cohesion force in the liquid causes surface tension.

Since the other substance is acetone which does not form strong intermolecular forces hence it has low value of surface tension. They have low cohesive forces and get stick to the surface and are spilled instead of attaining minimal volume.

7 0

4 years ago