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3 years ago

How many electrons will a non-metal generally have in its outer shell? 1 - 3 1 - 4 4 - 7 8

Chemistry

2 answers:

Andrews [41]3 years ago

8 0

<u>Answer:</u> The correct answer is 4-7.

<u>Explanation:</u>

A non-metal is defined as the element which gains electron to attain stable electronic configuration and to attain a negative ion which is anion.

$X+ne^-\rightarrow X^{n-}$

Non-metals are the elements which belong to Group 14 to Group 17.

The valence electronic configuration of the elements:

Belonging to Group 14 = $ns^2np^2$

Number of valence electrons = 4

Belonging to Group 16= $ns^2np^3$

Number of valence electrons = 5

Belonging to Group 16 = $ns^2np^4$

Number of valence electrons = 6

Belonging to Group 17 = $ns^2np^5$

Number of valence electrons = 7

Hence, the correct answer is 4-7.

AlladinOne [14]3 years ago

4 0

They generally have 4 - 7 electrons in their outer shell.

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Suppose you wanted to dissolve 40.0 g NaOH in enough H2O to make 6.00 dm3 of solution

dezoksy [38]

Molarity of solution = 1.6 M

<h3>Further explanation</h3>

Given

40 g NaOH

6 L solution

Required

Steps to solve the problem of molarity

Solution

No additional information about the question.

If you want to make the solution above, then we just need to put the existing NaOH (40 g) into 6 L of water, then do the stirring (in a warm temperature above the hot plate will speed up the NaOH dissolving process)

But if you want to know the molarity of a solution, then

1. we calculate the moles of NaOH

$\tt mol=\dfrac{mass}{MW}$

MW(molecular weight) of NaOH=

Ar Na+ Ar O + Ar H

23 + 16 + 1 = 40 g/mol

so mol NaOH :

$\tt mol=\dfrac{40~g}{40~g/mol}=1~mol$

2. Molarity(M)

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3 years ago

What is the wavelength of infrared radiation with a frequency of 3.85 x 10^12 Hz?

ELEN [110]

Answer:

Wavelenght is 7,79x10⁻⁵ m

Explanation:

The equation that connects wavelentgh (λ) and frequency (ν) is:

λ=c/ν

Where c is speed of light (3x10⁸ m/sec) and λ is expressed in lenght´s units and ν is expressed in "time⁻¹ " units (for example, sec⁻¹)

According to the details, if we just replace the given value of frequency, we just obtaing wavelenght data:

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3 years ago

What is the density of iron if it crystallizes in a body-centered cubic unit cell with an edge length of 287 pm

PSYCHO15rus [73]

Answer

Density = 7.87g/cm^3

Explanation:

Density is the ratio of mass of the given object to the volume of the object, in this question iron is the given object, then we make use of atomic number of iron

Given:

Length= 287pm = 287*10^-10cm

Atomic mass of Fe= 56.0u

Z=2(for body centered cubic unit cell)

Avogadro number (N 0)=6.022× 10^23

Density= ZM/a^3 × N

Where

Z= body centered cubic unit cell

Then substitute

N= Avogadro's number

a=Length

Density = (2× 56)/(287*10^-10cm)^3 × (6.022 × 10^23)

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Vikentia [17]

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