History and Parts
What did Ernst Rutherford discover?
The positive nucleus/protons
The atomic # tells you...
The number of protons
A positively charge atom is called a...
cation
What two things are considered pure substances?
elements and compounds
What is the name of MgCl2?
Magnesium chloride
What did Neils Bohr discover?
Electrons travel in different energy levels
Also called electron orbitals
If you have a mole of carbon atoms, it would weigh...
12.01 grams. This is the atomic mass.
If an atom gives electrons away, it becomes _________ charged.
positively
If a mixture looks the same throughout, it is a______________ mixture.
homogeneous
What is the formula for aluminum bonded with oxygen?
Al2O3
These particles are found in the the nucleus.
protons and neutrons
The elements go in order according to their......
Atomic number
A nitrogen ion has this charge.
-3
When dry ice sublimates, it is a ___________change.
Physical
Ionic compounds are made of:
metal and non-metal
These atoms have the same number of protons, but a different number of neutrons.
Isotopes
Elements in the same column, share...
similar properties
Which are quantitative measurements?
Mass = 12.7g, Temp = 21C, Color = dark red
Mass and Temperature
What is the name of this covalent compound? CCl4
Carbon tetrachloride
This part of the atom is negatively charged
electron
Elements in the same row have this in common.
Same number of electron orbitals.
A sulfur atom has 16 electrons. How many electrons does S-2 have?
18
How do you know for sure that a chemical change has occured?
A brand new material is formed.
Write the formula for dihydrogen monoxide
H2O