lola06032003

22.06.2021 • 

Chemistry

The human body contains many elements from the periodic table. It is mostly composed of oxygen and carbon, but trace elements also have a significant role. The table gives the mass, in kilograms, of some elements found in the human body, based
on a 70.0 kg person.
Atomic number
Element
Mass (kg)
8
oxygen
45.2
6
carbon
12.6
1
hydrogen
7.0
7
nitrogen
2.2
20
calcium
1.3
15
phosphorus
0.78
19
potassium
0.25
16
sulfur
0.18
others
0.60
total
70,0
Potassium makes up what fraction of the mass of the human body?

Ответ:

bitty3970

22.07.2021

Chemistry

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69

Explanation:

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Ответ:

raiderries

02.03.2020

Chemistry

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The element identified in the original electron configuration is Calcium, Ca, so move backwards from there. The noble gas you reach first is Argon. For the noble gas configuration, you'd use Argon and then 4s^2 to acknowledge that it's still Calcium that the electron configuration is identifying.

The answer is A, [Ar] 4s^2.

Let me know if you need more of an explanation on electron configuration itself.

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