Atomic Mass
What is an atom's atomic mass?
The mass of an atom
What is an atom's atomic number?
The number of protons it contains
What is an isotope?
Different forms of an element that have the same protons but different neutrons
What is a radioactive isotope?
Unstable isotopes that emit radiation
What is an element?
A type of atom with the same number of protons
What form of measurement is used when measuring atomic mass?
AMU (or atomic mass unit)
What is the difference between atomic mass and atomic number?
The atomic number is the number of protons; atomic mass is the total amount of protons and neutrons.
It starts to emit radiation.
DOUBLE JEOPARDY
Why are radioactive isotopes unstable?
They have too many neutrons, which makes the nucleus too large
Name the number of protons in this element:
Carbon
6
How do you find atomic mass?
You add the number of protons and the number of neutrons together
What do atoms of the same element have?
The same number of protons, thus the same atomic number
How many isotopes can there be for any given element?
Two or more
Why are radioisotopes dangerous?
They emit radiation, which can harm or destroy the cells of living organisms.
DOUBLE JEOPARDY
How are elements defined?
By their atomic number
DOUBLE JEOPARDY
Is it important to consider average atomic mass? Why?
Yes, because it can help you determine the most common form of an element.
DOUBLE JEOPARDY
The atomic number is important because...
It shows us the amount of protons in an atom
What is the name of an isotope followed by?
A dash (-) and the atomic mass of the isotope
When does a radioactive isotope stop emitting radiation?
Once it becomes stable
What two important numbers are associated with an element?
Atomic number and atomic mass
What is the atomic mass of copper if the atomic number is 29, the number of electrons is 29, and there are 34 neutrons?
63 amu
What is Iron's atomic number if its atomic mass is 56, the number of neutrons is 30, and the number of electrons is 26?
26
DOUBLE JEOPARDY
How many naturally occurring isotopes are in carbon?
3
a) Why does a radioactive isotope release radiation?
b) What does an atom do as it emits radiation?
a) To become stable
b) It becomes stable
What is this element's symbol:
Potassium
K