Chapter 2 Concepts Flashcards
What did John Dalton recognize?
That elements can form compounds.
Who organized the periodic table?
Dmitri Mendeleev
Who discovered the electron?
Joseph John Thompson
Plumb pudding model
What was Ernest Rutherford’s contribution?
He discovered that there were tiny holes at subatomic levels. Solar System model
Who created the model of an atom that still use today?
Niels Bohr
What is the electron shell formula?
2n^2
The outer most shell of any element can hold ____ electrons
8
Isotope
Same number of protons, Different number of Neutrons
Isotone
Same number of Neutrons, Different number of Protons
Isobar
Same atomic mass.
isomer
Protons and Neutrons are they same, but there is a different amount of energy in the nucleus
On the periodic table, how many periods are there? and are they rows or columns?
7 periods in rows
On the periodic table, how many groups are there? and are they rows or columns?
8 groups in Columns
Atoms in each period have
the same number of electron shells.
Atoms in the same group have
the same number of electrons in the outer most shell
