Question

I'LL MEDAL AND FAN FOR THE HELP!

1. Why do you think learning about how the atomic theory has evolved is important?

3. Compare and contrast the Bohr model of the atom with the modern model of the atom. What observations does the modern model explain that the Bohr model did not?

4. What are the shorthand and longhand electron configurations for chlorine?

5. Explain how the periodic table can help in writing electron configurations.

Answer 1

Number one is asking you opinion. I can not answer that for you. I will say that the atomic theory is important to chemistry and physic. It's there theory that atoms are small units that make up matter and there for ourselves and the world around us.
#2 you text book should explain both models to you. Let me give you a briefs explanation. Bhor's model shows the nucleus in the middle of the atom with the electrons in the outer rings of the atom. It shows how many electrons orbit the he nucleus and to what proximity. It's a 2D figure that was founded in I believe the early 1900's. The modern atom is know to be show in more dimensions. The electrons are shown the orbit, rather thanin neat circles around the nucleus, in clouds. There is different orbital patterns, energy levels and chemical property
It's depending on where they fit in the periodic table.

Answer 2

#3 oh I mean #4 electron configuration can be found by conting blocks on their periodic table. Chlorine is in the p block so we know that it s and p will be the only configuration blocks available. Now you are going to count blocks. Remember s block= Two electron per row where the p block = 6 per row. So start with hydrogen as 1s1 and he so 1s2 and so on. You will get this for chlorine 1s2 2s2 2p6 3s2 3p5. For short hand you take the noble gas be it in this case Ne and the. You finish with the configuration so [Ne] 3s2 3p5

Answer 3

I think I've already answered number 5.