Structure Of Atoms Flashcards
(25 cards)
Who is considered the father of modern atomic theory?
John Dalton
True or False: Democritus proposed that matter is made up of indivisible particles called atoms.
True
Fill in the blank: Antoine Lavoisier is known for the law of ________ of mass.
conservation
What did Joseph Proust contribute to chemistry?
The law of definite proportions
Which scientist discovered the electron?
Joseph J Thomson
Multiple choice: Who proposed that all matter is made up of atoms?
A) Democritus
What was John Dalton’s main postulate regarding atoms?
Atoms of a given element are identical in mass and properties.
True or False: William Prout suggested that all atoms are made of hydrogen.
True
Fill in the blank: George Stoney coined the term ________ to describe the fundamental unit of electric charge.
electron
What is the significance of Lavoisier’s work in chemistry?
He established the foundations of modern chemistry by introducing systematic chemical nomenclature and the law of conservation of mass.
Multiple choice: What does Proust’s law of definite proportions state?
A) Compounds are formed by the combination of elements in fixed ratios
Who first proposed the atomic theory that included the idea of chemical combinations?
John Dalton
True or False: Joseph J Thomson discovered the neutron.
False
Fill in the blank: The atomic theory proposed by Dalton was based on ________ and experimental evidence.
observations
What did William Prout theorize about atomic weights?
He theorized that atomic weights are whole number multiples of hydrogen.
Multiple choice: Which of the following scientists is associated with the discovery of isotopes?
C) William Prout
What is George Stoney known for in the field of physics?
Coining the term ‘electron’ and proposing the concept of fundamental charge.
True or False: Democritus’s ideas were widely accepted in his time.
False
Fill in the blank: Lavoisier’s experiments helped to disprove the ________ theory of combustion.
phlogiston
What is the primary focus of Joseph Proust’s law of definite proportions?
The constant composition of chemical compounds.
Multiple choice: Which scientist’s work laid the groundwork for the modern periodic table?
A) Antoine Lavoisier
What did Joseph J Thomson use to discover the electron?
Cathode rays
Fill in the blank: The concept of atoms being indivisible was first introduced by ________.
Democritus
True or False: The discovery of the electron led to the development of the field of quantum mechanics.
True
