Physics; atoms and isotopes Flashcards
What is the charge of proton, neutron and electrons?
p- +
e- -
n- 0
What is the mass of proton, neutron and electrons?
p- 1
n-1
e-0
where are of proton, neutron and electrons located ?
p-nucleus
n- nucleus
e- shells
What is the radius of an atom?
1X10 to the power of -10
what is the charge of the nucleus?
- positive
how are the electrons in an atom arranged?
electrons are in different distances from the nucleus (different energy levels)
what do the electrons do in an atom?
orbit around the shells
What is an isotope?
is when two atoms have the same number of protons but different number of neutrons
what does protons tell us other that their positive atoms?
number of protons determines the element
What is the relative atomic mass?
is an average value of the abundence of the isotopes of the element
true or false: atoms have no overall electrical charge
true
who was democritus and what did he think
he was greek, he thought that all matter is made up of tiny particles. he thought that particles had different size and shapes, which explained the different properties of substances
in what year and what did Dalton say
1800 said the atom is a sphere and said it cant be divided further more and that each element had a different masses
in what year and what did JJ Thomson think
in 1897, plum pudding model
what did rutherford do and when
1911, he did the golf fair experiment
- nuclear model
- alpha particles
- found neutrons
