Subscripts cannot be changed because they are the ratio of the amount. And as we know, in a chemical equation/reaction, mass cannot be created nor destroyed. Therefore, we cannot change subscripts, however, we could change coefficients. <span />
I don't know but I'm wasting 5 seconds of your time you can't take back sorry
When two atoms of Hydrogen combine together, or fuse, they make an atom of Helium.
Answer:
185.15 km/s
It is receding, that's a redshift
Explanation:
The radial velocity <em>V </em>of a star can be calculated by the formula:
V = c·Δλ/λ₀
Where c is the speed of light (3*10⁸m/s), Δλ is the wavelength shift (the difference between the wavelengths), and λ₀ is the wavelength that is not shifted (in this problem, 486.1 nm)
If we put the given data in the equation we're left with:
V = ![3*10^{8}m/s *\frac{(486.4-486.1)}{486.1}](https://tex.z-dn.net/?f=3%2A10%5E%7B8%7Dm%2Fs%20%2A%5Cfrac%7B%28486.4-486.1%29%7D%7B486.1%7D)
V = 185147.09 m/s
<u>Converting the velocity to km/s:</u>
= 185.15 km/s
- Because the line of the star's spectrum appears at a wavelength greater than the wavelength measured in the laboratory, <u>the star is receding, this is called a redshift.</u>
Answer:
The element is oxygen.
1s² 2s² 2p⁴
Explanation:
Let's consider the electron configuration of the excited state.
1s² 2s² 2p³ 3s¹
According to the Aufbau principle, the electron in 3s should occupy the shell with lower energy. The ground-state electron configuration is:
1s² 2s² 2p⁴
The differential electron is in the level 2. Then, the element is in the period 2.
The electrons in the last level are 2 + 4 = 6. Then, the element is in the group VIA or 16.
The element is oxygen.