Periodic Table
How many elements are represented on the periodic table?
118
The atomic number also equals the amount of _____ in an atom.
Protons
How many electrons can go in the 1st energy level?
2
Isotopes are different because they have a different number of ________
Neutrons
Half life is ______
The time it takes half a substance to decay
The top number is the ______ _______
Atomic Number
In a neutral atom, the protons are equal to the _____
the electrons
How many electrons can go in the second energy level?
8
The other way to write Carbon - 14 is what?
14 C
6
If a medication has a half life of 5 hours, how many half lives would it go through in 15 hours?
3 half lives
The bottom number is the _____ _____
Atomic Mass (average mass)
Protons are important because
They determine which element an atom is
In the ground state, the _____ energy level gets filled up first
First
The atomic mass on the periodic table is an average. Why?
Isotopes of elements have different masses
If you start with 800 g of a substance, how much will be left after 2 half lives?
200 g
_____ are mostly to the left of the periodic table
Metals
The electrons are important because
They are involved in chemical bonding
The electrons usually fill the first energy level before the others. Why?
The attraction between the electrons and the protons in the nucleus is stronger.
Show the following isotope undergoing alhpa decay:
14 C
6
It's 10
4
An isotope of hydrogen has a half life of 2 years. If you start with 300 g, how much will be left after 8 years?
18.75 g
The noble gases do not mix with any other elements - why?
They have the perfect number of valence electrons (8 - He exception =2)
Neutrons are important because
help to space out the protons
Complete the energy levels for Argon. How many valence electrons does it have?
1 = 2
2 = 8
3 = 8
Valence = 8
The most dangerous type of radiation is gamma. Why?
It is small and the hardest to block
The half life of Seroquel is 10 hours. If after 30 hours, you have 2 g left, how many did you start with?
16 g