Periodic Table Flashcards
0
Q
What is atomic mass
A
The average mass of all the isotopes of an element
Ex-carbon 12, 13, and 14
1
Q
What did Meneleev do in the 1800s
A
He made the periodic table based on atomic mass
2
Q
What did Moseley do in 1913
A
Bass to the periodic table on the atomic number
3
Q
What is a group
A
A column on the periodic table and they share the same number of valence electrons they are similar to chemical properties
4
Q
What is a period on the periodic table
A
They are on a row on the periodic table and they all have the same energy level
5
Q
What are the energy levels for an atom
A
1e-=2
2e-=8
3e-=18
4e-=32
