Atomic Number And Mass Number Flashcards
The smallest particle of an element that still has the same properties of that element is known as
Atom
Thomson Rutherford and milikan discovered that atoms were made up of even smaller particles called
Sub atomic particles
What are the sub atomic particles?
The proton
Neutron
And electron
The number of _______ the element has determines what type of element it is
Protons
What consists of the atomic number?
The number of protons which gives the atom its identity
What charge to protons have
+1 charge
Protons also consists of _____ which helps determine their mass
1 atomic mass unit
Do neutrons also hold a mass?
Yes and it’s 1amu with no electrical charge
What are isotopes
Same number of protons (gives the atom its identity)
But different number of neutrons
Some isotopes may have differences in their nuclear stability which may mean…. and why?
Some will be able to undergo more nuclear reactions than others
Because they have different amounts of neutrons in their nucleus
What is the mass number?
The total number of protons + neutrons
What was John Dalton’s 2 theories
Matter is made up of tiny particles called atoms that can’t be divided into smaller pieces or destroyed
Jd 2nd theory
Atoms of the same element will be exactly the same and that atoms of different atoms can combine to form compounds
Jj Thompson discovered the ______ and disproved Dalton’s theory that_______
Electron
Atoms can not be divided into smaller pieces but in fact they can( sub atomic particles)
Rutherford discovered what?
The nucleus and that the atom consists of mostly empty space
