Which of the following is NOT a feature of Iron (III) oxide? a. forms a protective barrier
b. falls off in flakes
c. red-orange in color
d. requires moisture to form

I think its it is A

Explanation:

Rust is red in colour, falls off in flakes, and forms when iron is wet. By process of elimination, it must be B.\

can i get/p>

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.