History
Democritus
Atoms are the tiniest particles of an element
True
who found the nucleus
bohr or Rutherford or Dalton
rutherford
whos theory did John Dalton Confirm
Democritus
The word atom comes from a Greek word "atomos" that means
indivisible
WHERE were atoms first introduced?
Greece
Atoms bond together to form molecules
true
Who came up with the theory that earth, air, fire, and water make up all the things around us?
Aristotle
According to Dalton's Theory, is it possible to conver atoms of one element into another?
yes it is
Which particles have approximately the same size and mass as each other?
Protons and Neutrons
..... is a standard number of chemical units such as atoms, molecules, ions and electrons
Mole
Atomic mass
Atomic number
None of the above
Mole
can atoms be divided into smaller pieces, if yes what are they called?
True, subatomic particles
Who determined that electrons orbit the nucleus in energy levels
Neil Bohr
What was Daltons original job
He worked as a teacher and did research in his spare time
According to atomic theory, electrons are usually found where?
outside the nucleus -- most of an atom's volume is the electron cloud
Bohr's solar system model involved the electrons having (a)
Fixed orbit
Changing orbit
No orbit
None of the above
Changing orbit
After Democritus's theory the idea of the atom was forgotten for more than 2000 years
True: because Democritus introduced the atom in 450 BC and was only re-introduced in the 1800s
Who's model was called the Plum pudding model (+1 for why)
Thompson, he said that an atom is like plum pudding with atoms scattered throughout it
Which part of Daltons atomic theory is false
Dalton stated than an atom could not be divided into smaller pieces. This was proven to be wrong, as subatomic particles exist, such as protons etc..
Changing the number of neutrons of an atom changes its:
isotope, element, charge , ion
isotope
which experiment was done by JJ Thomson in which he discovered the electron
cathode tubes experiment
In Ernest Rutherfords Gold foil experiment 8,000 out of 10,000 particles bounced back.
False
who said that the electrons circle the nucleus with a fixed orbit.
Rutherford
give an example of an experiment that Dalton provided evidence for atoms
ex. pressure of gasses
The nucleus of an atom can be described as:
spacious and negatively charged
dense and positively charged
spacious and positively charged
dense and negatively charged
dense and positively charged