Ask your homework questions to teachers and professors, meet other students, and be entered to win \$600 or an Xbox Series X ðŸŽ‰Join our Discord!

# Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry deals with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds. Chemistry also involves understanding the properties and interactions of individual atoms and molecules for use in larger-scale applications.

#### Topics

No Related Subtopics

### Discussion

You must be signed in to discuss.

### Recommended Quiz

#### Chemistry 101

Create your own quiz or take a quiz that has been automatically generated based on what you have been learning. Expose yourself to new questions and test your abilities with different levels of difficulty.

### Video Transcript

So for the next problem will be calculating the number of neutrons, electrons and protons for the calcium count on eso start. We can first calculate the number of protons because this is just the atomic number. Eso for calcium. According to the Pew Rock table, it has 20 protons. So that is pretty easy to figure out on dso to figure out the number of neutrons we need to use. Our formula of number of neutrons is equal to the atomic weight of your Adam subtracted by the atomic number or number of protons. So the atomic weight well, calcium is 40. So then if you subtract 20 you will get 20. Which means that there are warning neutrons in calcium. So for a neutral Adam, the number of protons should equal the number of electrons. Um, but in this case, we're trying to figure out the number of electrons for calcium two plus s. So that means that urgently we have Tony electrons, but because it has a plus to charge, that means that the calcium is deficient by two electrons. So that means we need to subtract two to obtain they not charge of plus two, which means that there are 18 electrons. So for the answer to this problem, calcium two plus has 20 protons, 20 neutrons and 18.

Brown University

02:06