Term 1 Scientists Flashcards
Who discovered how to split substances in 1789
Antoine Lavoisier
Who discovered that elements could not be split as each has a separate atom
John Dalton 1803
What did Ernest Rutherford discover and when?
1909 he discovered the NUCLEUS
1911 he named the positively charged particles in the nucleus PROTONS
What did JJ THompson discover in 1890
That ATOMS are made up of two parts - POSITIVE AND NEGATIVE
What did Niels Bohr discover? And when?
1913
ELECTRONS ORBIT the nucleus
Sets of electrons called SHELLS
Erwin SCHRODINGER discovered what?
That electrons move in WAVES around the nucleus
What is an element
Element has ONE type of atom
All the periodic table of elements
Example
HYDROGEN H
OXYGEN O
What is a compound ?
Two or more types of atoms which are bonded
Elements are bonded by ELECTRONS
Example
Water H20
Hydrochloric acid H2CL
What is a mixture ?
Two or more types of atoms or compounds NOT BONDED
They are mixed together but not bonded
Protons
Positive charge
Shows in the ATOMIC NUMBER
Neutrons have what type of charge?
Where do you find neutrons?
Neutral
In the Nucleus
Remember
Neutrons are Neutral in the Nucleus !
Electrons have what kind of Charge ?
What do electrons do ?
Electrons have a NEGATIVE CHARGE
Electrons BOND ATOMS
Remember the negative charge of electrons is like a magnet that pulls atoms together
What is the smallest type of matter?
Atom
JJ Thompson discovered that atoms are made up of positive and negative parts in 1890
Who discovered neutrons in 1932v
James Chadwick
Discovered that atoms not only have protons and electrons but also have NEUTRALLY CHARGED PARTICLES called NUTRONS
How to calculate atomic mass
Neutrons and protons
