Lavoisier came up with what we know as Law of Conservation of Mass , states that "mass can neither be created nor destroyed". The quantity of an element always equal from starting mass to final mass .

Because beside being a scientist he was a 'tax farmer'. Collecting taxes is never easy but it was particularly difficult in the pre-modern age and one solution was for the state to assess the potential tax take from a region and 'sell' a contract for collection at a large discount to the highest bidder. So for example, estimated revenue $1m is sold to a tax farmer for $0.5m. So the closer the tax farmer can collect up to $1m, then the more he makes in profit. Naturally, tax farmers and their agents used some 'sturdy' methods in collecting and this made them particularly unpopular.

They made people aware about how burning happens

they were in a relationship until priestley had an affair with stuhl and then married Quenn victoria

Lavoisier is revered as the father of modern chemistry because of the quantitative measures taken to prove how elements work. Lavoisier's most famous experiment involved oxygen and how it can be used in combustion.

He didn't.

The name "sulfur" was in use for this substance since the days of the Romans.

LaVoisier simply showed that sulfur could not be broken down into any constituent parts, and was thus an "element."

Lavoisier conducted a number of experiments that were based on the assumption that matter can neither be created nor destroyed and validated it through the experiments. This led to the formulation of the Law of Conservation of Mass (or Matter).

french chemist who proved the law of conversation of mass

solids,liquids, and gases Novanet

he grouped the table into metals, non metals and gases.

He discovered that the phlogiston theory was incorrect, and recognized and named oxygen and hydrogen. He accepted that sulfur is an element, had contributions to metric system, established a list of chemical elements, discovered that diamond is a form of carbon, discovered that water is formed from oxygen and hydrogen, etc.

He proposed independently (he had any knowledge of Lomonosov works) the law of mass conservation.

yes he did ! Dumb people ..

Antoine Lavoisier was French

There was no evidence until at least 2 yrs into the work of the phlogiston theory

From scienceworld.wolfram.com: He married a young, beautiful 13-year-old girl named Marie-Anne, who translated from English for him and illustrated his books.

Antoine Lavoisier determined that oxygen was a key substance in combustion, and he gave the element its name. He developed the modern system of naming chemical substances and has been called the “father of modern chemistry” for his emphasis on careful experimentation.

Antoine Lavoisier is credited with the discovery of the of mass conservation. But Lavoisier had many other important contributions in chemistry.

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. ... If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.

By experimenting with a triple beam balance

Lavoisier helped to transform chemistry from a science of observation to the science of measurement that it is today.

by doing so, he created a balance that would measure mass to the nearest 0.0005 grams.