Chemistry 4.1 and 4.2
What is the relative mass of an electron?
1/1840
About how many more times massive is a proton than an electron.
1835 times
What are the ideas of Dalton's atomic theory?
Are identical in size, mass and different properties in given element. Cannot de divided, created or destroy
The smallest particle of an element that retains the properties of that element
Atoms
Evidence about Dalton's atomic theory has shown that
Atoms are divisible
Which of the following was originally a tent of Dalton's atomic theory, but had to be revised about an century ago?
Atoms are tiny indivisible particles.
Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements?
Charge-to-mass ratio of electrons as the same, regardless of the gas used.
Who was the man who lived from 460 B.C. - 370B.C was among the first to suggest the idea of atom?
Democritus
A negatively charge subatomic particle
Electron
What discovery did J.J. Thomson make that improvement upon Dalton's atomic theory?
Electron
What is the relative charge of a proton?
Electron
List at least 4 'truths' about subatomic particles with regards to charge and mass/weight
Neutrons, proton and electron
The central part of an atom containing protons and neutrons
Nucleus
A postively charge subatomic particle
Proton
What is the relative charge carried by an electron?
Proton
The smallest particle of an element that retains the properties of that element is a(n) ____.
Proton and neutron, and electron
The particles that are found in the nucleus of an atom are ____.
Protons and neutron
Who conducted experiments to determine the quantity of charge carried by an electron?
Robert A. Milllikan
Which model of the atom is thought to be true
Rutherford's Gold- Foil Experiment
Which of the following is correct concerning subatomic particles?
The neutron was discovered by Chadwick in 1932
Which hypothesis led to the discovery of the proton?
When a neutral hydrogen atom loses an electron a positively charged particle should remain
How did Dalton make improvement over Demicritus' s ideas?
atoms retain it identify in a chemical reaction and
The range in size of most atomic radii is approximately
d) 5 x 10^-11m to 2 x 10^-10 m
All atoms are
neutral, with the number of protons equaling the number of electrons.
How are the numbers of atoms in a copper coin the size of a penny related with the number of people on Earth?
that in a copper penny, there is one atom for every person on Earth
The nucleus of an atom is
the central core and is composed of protons and neutrons.