Atomic Structure Flashcards
(25 cards)
What is a molecule?
2 or more atoms chemically joined
What is an atom?
The smallest particle forming everything
-> They don’t touch
What is an element?
2 or more identified atoms
The ________ table lists all of the elements
Periodic
What is a compound?
2 or more different elements that are chemically joined
What is the mass number of an element on the periodic table?
The number of protons + neutrons
What is the atomic number of an element on the periodic table?
The number of protons
What is an isotope?
Atoms with the same element name that have a different number of neutrons
What is the filled electron configuration?
2, 8, 8, 2
What is the relative charge of a Proton?
+1
What is the relative charge of a Neutron?
0 (neutral)
What is the relative charge of a Electron?
-1
What is the relative charge of an atom?
0 (neutral)
Who thought that atoms were tiny spheres in 1803?
John Dalton
Give 3 parts to John Daltons theory of the tiny spheres as atoms.
1) Indivisible sphere that cannot be broken down into anything simpler
2) All atoms of one element are identical
3) Different elements have different atoms
4) In chemical reactions, atoms rearrange to make different substances
Who came up with the Plum Pudding theory?
JJ Tompson
Explain the Plum Pudding theory.
A ball of positive charge with smaller negative particles throughout
What was JJ Thomason’s discovery that led to the Plum Pudding model?
Atoms weren’t solid spheres
Who proposed the Nuclear model?
Ernest Rutherford
What did Rutherford discover from his model?
That particles don’t directly pass through the atom, some deflect and some reflect
What did Neil’s Bohr measure?
The energy electrons needed to move position
How are the electrons organised in Neil Bohr’s model?
Into shells or energy levels.
What did James Chadwick discover?
Neutrons
True or false, James Chadwick finalised the atom.
True
