atomic
what does the atomic number represent? atomic mass?
The atomic number represents the number of protons (and subsequently the electrons within an atom)
The atomic mass represents the mass of protons and neutrons within an atom
what are isotopes?
Atoms with eh same atomic number but different atomic mass
what are the four types of binding energy and what do they do?
1. Strong nuclear force- hold neutrons and protons together
2. electromagnetic- attracts protons and electrons to each other
3. weak nuclear force-responsible for decay
4.gravity- force of attraction between all forms of matter
What does our sun use? Our power plant?
The sun uses fusion, the power plant uses fission
How many dots would Iodine (I) get?
7, since it is in the seventh valence electron level
What has to be equal in the atom?
Electrons and protons have to be equal in the atom so that the charge is neutral!!
The time it takes for half of an element to decay into something stable is called the?
Half life
Gamma Decay
If an element takes in an electron, what would the charge be and what is the ion called?
it would be negative, anions
Do covalent bonds have higher melting points?
NO
What are the max amount of electrons in each energy level?
1:2
2 &3 :8
4 &5 : 18
6 & 7: 32
differentiate fusion and fission
Fusion is the combination of lighter atoms together.
Fission: a nucleus breaking apart into two and releasing a neutron that goes and hits another nucleus (chain reaction).
Which decay causes the atomic mass to change?
Alpha
What are characteristics of nonmetals? Metals?
Nonmetals:
Poor conductors of electricity 2.Brittle (break easily. 3.Dull appearance (not shiny)
Metals:
Conduct electricity 2. Malleable (bend easily. 3.Luster (shiny appearance)
What elements are the givers? Takers?
Metals are the givers, non metals are the takers
What is unique about every element?
The atomic Number
Describe Covalent bonds
Chemical bonds in which the atoms share the electrons. Formed between two nonmetals.
If alpha decay were to occur, what direction would you move on the periodic table?
You would move two to the left for alpha decay and 1 to the right for beta decay.
If the atoms weigh less than Iron they go through?
Fusion!
Draw the ionic bond of Na3N
Answer on board
What is the outermost energy level? How do we find it?
Valence Electrons, we find them by using the periodic table and going down the families but skipping the transition metals.
How do you figure out the oxidation level?
You take the amount electrons that it would give or take to reach the octet level.
As the mass number increases.....
So does the binding energy
How do you write the formula for an element?
Na +O2 ->
Now balance it
Take the oxidation numbers and criss cross them to the other element. The positive element is always written first, and the charges are dropped.
Na2O
4Na +O2-> 2Na20
Draw the covalent bond of H20
On the board