Chapter 2 FC Flashcards
Protons + _________ are in the nucleus of the atom.
Neutrons
Protons have a __________ electric charge.
Positive
Electrons have a __________ charge.
Negative
Neutrons have no electrical _________.
Charge
The electrons are in space around the nucleus in the what?
Electron cloud
Atoms are extremely ________.
Small
Who did an experiment to measure the charge-to-mass ratio of the electron?
J.J. Thomson
J.J Thomson used electrical and magnetic fields to cause offsetting _____________ of cathode rays (electrons).
Deflection
J.J. Thomson obtained the ________ charge-to-mass ratio with different cathodes in the cathode ray tube.
Same
J.J. Thomson concluded that cathode ray particles are a fundamental particle of __________.
Matter
Who determined the the charge-to-mass ratio of the electron (e/m).
J.J. Thomson
Robert Millikan determines the charge on an electron in the what experiment?
Millikan oil drop experiment
What were used to dislodge electrons from gaseous atoms that attached to oil drops and fell in the Millikan Oil Drop Experiment?
X-rays
Millikan determines the amount of charge on every drop was always a multiple of _____________. (The charge on a single electron)
-1.6 x 10^-19 C (C=Coulombs)
What is the charge on a single electron?
-1.6 x 10^-19 C
What is the electron mass?
9.109389 x 10^-28 g
The experimental evidence for protons existence came from cathode ray studies with what?
Cathodes with holes in them
e/m ratio changes with the identity of the gas, with the largest e/m ratio for ____________ gas.
Hydrogen
Other e/m ratios are always a multiple of __________ gas which suggest H+ as a fundamental particle called a __________.
Hydrogen
Proton
What’s the number of a proton charge?
1.60217733 x 10^-19 C
Who discovered neutrons in 1932 using nuclear reaction techniques?
J. Chadwick
What’s the charge and mass of a neutron?
Charge=0
Mass= 1.6749286 x 10^-24 g
The modern view of the atom was developed by who?
Ernest Rutherford
All positive charge and most mass of the atom is concentrated where?
Nucleus
All atoms of the same element have the same number of what in the nucleus?
Protons
The atomic number is found where on the symbol?
Above
The atomic weight is found where on the symbol?
Below
Carbon has 6 protons and 6 neutrons and has a mass standard of what?
12 atomic mass units
How do you find the mass number?
of protons + # of neutrons
An atom with a definite atomic number and a mass number is a what?
Nuclide
Although all boron atoms have 5 protons, they can have different numbers of __________.
Neutrons
Atoms of the same element but different mass numbers are what?
Isotopes