Please work out all the problems on this page, no links, no i don't knows please do not take advantage of me or my points please actually answer these questions

the second choice

Explanation:

hi! im not 100% sure but i do think its particles close together and moving past each other ( the 2nd choice) sorry its wrong  

pure substance: iron,copper

impure substance: water,charcoal

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.