The answer to the question is a.
In an atom, the first energy level can hold
1 answer:
Answer:
2, 8, 18
Explanation:
The number of orbitals for any level of interest n is calculated by a formula . Since each orbital contains a maximum of 2 electrons, we can calculate the total number of electrons in an nth orbital by
.
- As a result, the first energy level for n = 1 can hold a maximum of
electrons,
- The second energy level can hold a maximum of
electrons,
- The third energy level can hold a maximum of
electrons.
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Answer:
The mean free path = 2.16*10^-6 m
Explanation:
<u>Given:</u>
Pressure of gas P = 100 kPa
Temperature T = 300 K
collision cross section, σ = 2.0*10^-20 m2
Boltzmann constant, k = 1.38*10^-23 J/K
<u>To determine:</u>
The mean free path, λ
<u>Calculation:</u>
The mean free path is related to the collision cross section by the following equation:
where n = number density
Substituting for P, k and T in equation (2) gives:
Next, substituting for n and σ in equation (1) gives:
Answer: Isotope Oxygen 18 will remain the same before and after the reaction because the amount of neutrons are the same in a isotope
Explanation:
Isotopes 18-17 and 16 are the most stable in earth. Keep in mind that a Isotope is an atom that has equal amount of protons and electrons but neutrons ( as you can see in the imagine below) . That is why, an isotope like oxygen 18 will remain the same in a chemical reaction, because there is only a electron transfer when doing a new molecule.
