What metals and nonmetals are in a backpack

Mainly Carbon, Oxygen, Hydrogen, Nitrogen, Magnesium, Aluminium, Iron and Chromium.

Explanation:

Hello,

In this case, it is widely known that backpacks have are made up of special fabrics such as Cordura, Cotton canvas, Nylon, Polyester and PVC fabrics which have the following elements in common: Carbon, Oxygen, Hydrogen and Nitrogen. which provide backpacks waterproofness,  resistance and stability.

In addition, some metals such as magnesium and aluminium as diecasts or directly stainless steel (containing iron, carbon, chromium, etc) are used to make the zippers.

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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.