It took 380,000 years for electrons to be trapped in orbits around nuclei, forming the first atoms.
These were mainly helium and hydrogen, which are still by far the most abundant elements in the universe. Present observations suggest that the first stars formed from clouds of gas around 150–200 million years after the Big Bang. Heavier atoms such as carbon, oxygen and iron, have since been continuously produced in the hearts of stars and catapulted throughout the universe in spectacular stellar explosions called supernovae.
Answer:
<em><u>≅ 50, 909 nm</u></em>
Explanation:
Wavelength, λ = 
Given:
speed of light = 
f = 5.89 × 
∴ λ = 3×
/ 5.89 ×
= 0.0000509 m <em><u>≅ 50, 909 nm</u></em>
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We know that polar molecules' attraction is stronger than that of non polar ones; this can be a good basis for us to check the substances' polarity. Knowing that polar forces are stronger, we can eliminate all options referring to them as being the weaker force; that is, options C and A. Next, we know that stronger forces will result in lower volatility so we can eliminate option D. The answer is B, assuming the compound has an odor.
Answer:
HCl will dissociate more fully and produce more H₃O⁺ ions.
Explanation:
HCl is strong acid and it dissociate fully and produce more H₃O⁺ ions as compared to the HF.
Although H-F is stronger bond as compared to the HCl but stability of product also count, and fluorine ions F⁻ which are formed after dissociation are not more stable as Cl⁻ ions.
Both F⁻ and Cl⁻ are carried -1 charge, but in case of chloride ions negative charge is spread over large surface area while in case of fluorine it is restricted to small surface. Thus F⁻ are becomes unstable.
Thus in dissociation equilibrium is shifted to wards HF and cause lower dissociation.
