Considering the element with atomic number 4 and atomic number 9 on the periodic table. Give the reason(s)/cause(s) for these elements to be different in
a) reactivity, b) forming ions, and charges of these ions. (4 points) *
Your answer

the role of the microscope world in creating new materials .

the dissolution of polymer can be thermodynamically described in 2 steps.

c

explanation:

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.