Select the correct scientist for each of the following advances in creating the modern periodic table.
organized elements into four groups based on
properties:
developed the law of octaves:
arranged elements by atomic number:

Organized elements into four groups based on properties: Antoine Lavoisier.

Developed the law of octaves: John Newlands.

Arranged elements by atomic number: Henry Moseley.

A periodic table can be defined as an organized tabular array of all the chemical elements, which is typically arranged in order of increasing atomic number or number of protons (in rows).

Antoine Lavoisier in 1789, organized the chemical elements into four groups such as:

Developed the law of octaves: John Newlands.

Arranged elements by atomic number: Henry Moseley.

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Lavoisier; Newlands; Moseley

Explanation:

In 1789, Antoine Lavoisier grouped the elements into gases, nonmetals, metals, and earths.

In 1865, John Newlands developed the Law of Octaves. He stated that "any given element will exhibit analogous behaviour to the eighth element following it in the table."  

In 1914, Henry Moseley found a correlation between the X-ray wavelength of an element and its atomic number. He was then able to restructure the periodic table according to atomic numbers.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

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.