Oxygen decays to form nitrogen. 15 8 o → 15 7 n + 0 1 e this type of nuclear decay is called .

decay

Explanation: General representation of an element is given as: where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

:  It is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. This is also known as -decay. In this the mass number remains same.

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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.