Why is an element considered a pure substance? ill give brainliest

Elements can NOT be separated into other types of matter (physically or chemically). Therefore, elements are pure substances. google

Explanation:

Pure substances are either elements or compounds. Elements can NOT be separated into other types of matter (physically or chemically).

Explanation:

Therefore, elements are pure substances. Ex: Hydrogen gas is a pure substance, as it is made up of only Hydrogen atoms or molecules.

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.

answer; /// the above statement is (true);