Phosphorus trichloride is used in the production of chemicals that keep plants from growing in a specific area. this
compound is made of one phosphorus atom represented by the chemical symbol p and three chlorine atoms
represented by the chemical symbol ci.
what is the chemical formula of this compound?
o pci
орсіз
op3ci
1p3ci

14,16 18 reacts with group

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.