SCIENTISTS
Who described the atom as Plum Pudding
JJ THOMSON
Which subatomic particle has a negative charge?
electron
All the mass of the atom is found in the _____________ of the atom.
nucleus
What is the atomic number of Iron?
26
This subtaomic particle has a mass of zero.
electron
How many neutrons are in Iron-56?
30 neutrons
Rutherford’s gold foil experiment provided evidence that there is what
Nucleus
Which subatomic particle has a positive charge?
proton
What happened to most of the alpha particles fired at the gold foil?
They passed straight through.
How many protons does Oxygen have?
8
The average mass of all naturally occurring isotopes of an element.
Atomic Mass
What unit is used to measure average atomic mass?
amu
Who thought the atom looked like a billiard ball?
John Dalton
Which subatomic particle has no charge?
neutron
I have the same number of protons but a different number of neutrons.
isotope
What is the mass number of Sodium?
23
The region of space surrounding the nucleus where an electron is likely to be found.
electron cloud
How many protons, neutrons and electrons does an atom with an atomic number of 50 and a mass number of 125.
50 P
50 e-
75 n
Aristotle thought that all matter was made of what
Air, Water, Earth, Fire
The number of protons in one atom of an element is that element’s
atomic number
These 2 subatomic particles have the same mass.
protons and neutrons
How many neutrons does Chlorine have?
18
Name the 3 isotopes of Hydrogen.
Protium
Deuterium
Tritium
An element has an atomic number of 76, how many protons, neutrons and electrons does it have? Name the element.
Osmium
76 P
114 n
76 e-
The Greek philosopher Democritus coined this word for a tiny piece of matter that cannot be divided
What is "atomos"
Mass number-atomic number=
neutrons
Why did some of the alpha particles in the Gold Foil experiment get deflected?
Likes repel- Alpha particles are positively charged and when they hit the positively charged nucleus, they were deflected.
This element has 19 protons and 20 neutrons, how many electrons does it have and what is its mass number?
19 electrons, 39
This man said electrons circle the nucleus like planets circle the sun.
Niels Bohr
What does the 84 stand for in Krypton-84
Mass number