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-Dominant- [34]
3 years ago
8

What phenomenon in nature do scientists use to define the length of a meter? Why is this a better definition than “the length of

a standard meter stick”?
Chemistry
1 answer:
sergey [27]3 years ago
8 0

Answer:

The natural phenomenon used to describe the length of a meter is the speed of light. The length of a meter is the length a light path travels in 1/(299792458) seconds through a vacuum.

The definition is better due to the uncertainty involved in the use of the length of a standard meter stick because the length of the meter stick could change due to atmospheric conditions from place to place

Explanation:

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The oxygen atom is smaller than the sulfur atom because _____(1) the outer electrons of oxygen are more effectively screened fro
Romashka [77]

Answer: Option (2) is the correct answer.

Explanation:

Atomic number of oxygen atom is 8 and its electronic distribution is 2, 6. So, it contains only 2 orbitals which are closer to the nucleus of the atom.

As a result, the valence electrons are pulled closer by the nucleus of oxygen atom due to which there occurs a decrease in atomic size of the atom.

Whereas atomic number of sulfur is 16 and its electronic distribution is 2, 8, 6. As there are more number of orbitals present in a sulfur atom so, the valence electrons are away from the nucleus of the atom.

Hence, there is less force of attraction between nucleus of sulfur atom and its valence electrons due to which size of sulfur atom is larger than the size of oxygen atom.

Thus, we can conclude that the oxygen atom is smaller than the sulfur atom because the outer orbitals of oxygen are located closer to the nucleus than those of sulfur.

3 0
3 years ago
The process by which cells chemically break down small food molecules and release chemical energy for the cell’s use is called
Crazy boy [7]

Answer: HEY THERE!

Explanation: HERE IS YOUR ANSWER

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<em>HOPE THIS HELPED AND HAVE A NICE DAY!</em>

5 0
3 years ago
Read 2 more answers
Why do non-metal aroms form covalent bonds e.g. H2O​
Oksana_A [137]

Answer:

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7 0
2 years ago
Why is the atomic mass of most elements not a whole number?
Crank
The atomic mass is the average of the isotopes of the element meaning most averages of isotopes will not be whole numbers
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The term that refers to compounds that can form hydrates but do not contain water molecules is anhydrous.
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