Show:
Atoms
John Dalton and the Periodic Table
Electron Shells and Abbreviations
Metals
Molecules, Compounds, and Physical and Chemical Changes
100
What Greek person came up with the idea of an atom?
Democritus
100
Who was John Dalton?
He discovered atoms existed and that they are made up of elements.
100
Who was Niels Bohr?
He figured out that electrons go around the elements in shells.
100
What is malleable?
Metal can be molded.
100
What is the difference between molecules and compounds?
Molecules have more than one atom or different types of atoms and compounds have to have more than one type of atom.
200
What is the charge of a proton?
Positive
200
Where is the mass of the atom?
It is in the nucleus.
200
What are electron shells?
They hold a certain number of electrons.
200
What is ductile?
Metal can be turned into wire.
200
How do you show the compound for water and carbon dioxide?
H20 and C02.
300
What is the charge of an electron?
Negative
300
Who was Dmitri Mendeleev?
He made up the periodic table.
300
How do we write the atomic elements on the periodic table?
We show them as abbreviations.
300
What does conduct mean?
Metal can allow electricity to flow through them.
300
What is a physical change?
When something changes how something looks but not what it is made of.
400
What is the charge of a neutron?
No charge!
400
What is the periodic table?
It shows all the elements in groups.
400
What is the abbreviation for hydrogen?
It is H.
400
What metals are good for conducting electricity?
Silver and copper.
400
What is a chemical change?
When something changes how it looks and what it's made of.
500
What are sub-atomic particles?
Protons, electrons, and neutrons
500
What are the numbers by the names of the elements in the periodic table?
They tell you how many protons or electrons an element has.
500
What is the abbreviation for gold?
It is Au.
500
How many of the elements are metals?
About 2/3.
500
Why are chemical changes important?
We need them for life!