Consider a hydrogen atom in the ground state. What is the energy of its electron? Now consider an excited‑state hydrogen atom. What is the energy of the electron in the =3 level?

What is important to study for nios grade 12 chemistry? i have only one month left.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397