Physical vs. Chemical properties & Changes
Evaporating water is an example of a _____________ change.
Physical
This man came up with the billiard ball model.
John Dalton
This is the positive subatomic particle
Proton
Elements and compounds are this type of substance.
Pure substances.
Group 17 elements that form salts
Halogens
Density, malleability and crystal shape are examples of this.
Physical properties
This person determined that most atoms are empty space with a positively charged nucleus.
Ernest Rutherford
The rows in the periodic table are called _____________ and the columns are called _____________ or ____________.
Periods, groups or families
Solutions, compounds and colloids are this type of substance.
Mixtures
Group 2 elements that are reactive.
Alkaline Earth metals
Rusting and baking are examples of this.
Chemical changes.
This scientist discovered subatomic particles
JJ Thomson
Elements in the same _______________ share similar properties on the periodic table.
Group
The atomic number of an element represents the # of _________ and ____________.
Protons and electrons
Have properties such as being shiny, malleable and good conductors.
Metals
How readily a substance reacts can be defined as this.
Chemical property
This scientist discovered that electrons move around the nucleus in shells.
Niels Bohr
This group is the most reactive group of metals on the periodic table. State the group name and number.
Alkali metals, group 1
To get the number of neutrons of an element you need to go the ______________ - _______________.
Atomic mass - atomic number
Usuallly dull, brittle and do not conduct electricity
Non-metals
When bonds are broken and new molecules are formed, this type of change has occurred.
Chemical
This scientist came up with the organization of the periodic table- that we largely follow today.
Dmitri Mendeleev
This group is the most stable (unreactive) group of gases on the periodic table. State the group name and number.
Group 18, Noble Gases
The atomic mass represents the mass of the _________________ + _____________.
Protons + neutrons
In CO2, how many total atoms are there?
3