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the physical and chemical properties of elements should be most similar within the same?

a. period
b. group
c. quantum level
d. oxidation state
I figured it would was b. group

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Kimberli B. | I can help you MASTER Organic ChemistryI can help you MASTER Organic Chemistry
5.0 5.0 (43 lesson ratings) (43)
The answer is b. Elements in the same group have the same number of valence electrons and so interact with other elements in a similar way. They display similar physical and chemical properties. For example, the halogens (F, Cl, Br, I) all react similarly. 
Stanton D. | Tutor to Pique Your Sciences InterestTutor to Pique Your Sciences Interest
4.6 4.6 (42 lesson ratings) (42)
This is a bit of a deceptive question -- the more you know, the more it will irritate you! The *chemical* properties can follow the group (stoichiometry of reactions, to some extent energetics as well).
But the physical properties -- the best you can say, is that the elements may vary MORE across a period than they do down a group. Consider N, P, As, Sb, and Bi -- these range from a gas vaporizing at 63 K to a metal melting at 544 K and vaporizing at 1837 K.  You wouldn't call these similar, EXCEPT by comparison with a period: say, Li to F, with C melting at 4100 K !
Kirill Z. | Physics, math tutor with great knowledge and teaching skillsPhysics, math tutor with great knowledge...
4.9 4.9 (174 lesson ratings) (174)
Correct. Elements within group have similar structure of electronic shells, therefore they have similar affinity to electrons (electro negativity) and, therefore, have similar chemical and physical properties.