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spin [16.1K]
3 years ago
9

Is my answer right?

Chemistry
1 answer:
Ahat [919]3 years ago
7 0
Yes the answer is 1s22s22p63s23p64s23d5
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When determining the formula for a compound, it is important to know the valence numbers of each element. Suppose you want to wr
Damm [24]

Explanation:

The valency of the element is the measure of the combining power of the element with the other atoms when the element forms compounds or molecules.

<u>Thus, valency has to known to find the how the elements have been combined and how many electrons have been lost, gain or shared.</u>

Given that:

Element A has 3 valence electrons and element B has 2 valence electrons. To find the ionic compound, the valency of the cations and the anions are interchanged and are written in subscripts. Thus,

A        B

3          2

Cross multiplying, we get the formula : A_2B_3

<u>Hence, 3 is the subscript for Element B.</u>

3 0
3 years ago
The initial movement of groundwater into the atmosphere to form clouds is due to what?
earnstyle [38]
This is the water cycle and the process is Evaporation.
6 0
2 years ago
Read 2 more answers
Is hot tea homogeneous or heterogeneous?
OleMash [197]
<span>homogeneous  because particles are mixed uniformly</span>
6 0
3 years ago
A freezer compartment is covered with a 2-mm-thick layer of frost at the time it malfunctions. If the compartment is in ambient
ruslelena [56]

Answer:

The time required to melt the frost is 3.25 hours.

Explanation:

The time required to melt the frost dependes on the latent heat of the frost and the amount of heat it is transfered by convection to the air .

The heat transferred per unit area can be expressed as:

q=h_c*A*\Delta T\\\\q/A=h_c*\Delta T

being hc the convective heat transfer coefficient (2 Wm^-2K^-1) and ΔT the difference of temperature (20-0=20 °C or K).

q/A=h_c*\Delta T=2\frac{W}{m^2K}*20K=40\frac{W}{m^2}

If we take 1 m^2 of ice, with 2 mm of thickness, we have this volume

V=T*A = 0.002 m * 1 m^2=0.002m^3

The mass of the frost can be estimated as

M=\rho * V=700\frac{kg}{m^3}*0.002m^3= 1.4 kg

Then,  the amount of heat needed to melt this surface (1 m²) of frost is

Q=L*M=334\frac{kJ}{kg}*1.4kg= 467.6kJ

The time needed to melt the frost can be calculated as

t=\frac{Q}{(q/A)}=\frac{467.6kJ/m2}{40W/m2} = 11.69\frac{kJ}{W}*\frac{1W*s}{1J}*\frac{1000J}{1kJ}=   11690s=3.25h

7 0
2 years ago
PLeas Answer with A B C or D please be QUICK :&gt;
Lena [83]

<em>Answer: </em>D

<em>Explanation:</em>

chemical formula of methane: CH4

electron configuration of C: 2,4

electron configuration of H: 1

there are 4 hydrogen atoms that donated 1 electron each to C

therefore it's D.

3 0
2 years ago
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