¿POR QUÉ SE LE LLAMA INDICADOR UNIVERSAL AL PAPEL p H? ¿DE QUÉ ESTÁN HECHOS LOS ELECTRODOS DEL POTENCIÓMETRO?
SI LA SALIVA HUMANA TIENE NORMALMENTEUN p H DE 7.4 (CASI NEUTRO) ¿QUÉ SUCEDE
CUANDO DISMINUYE, ES DECIR CUANDO LA SALIVA SE VUELVE ÁCIDA?

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.