2. Who discovered the periodic
table?
Dmitri Mendeleev
He was a russian chemist.
It was created by him in, 1869.
3. How did the subject arise?
Mendeleev wanted an organized way of showing the
elements that were known by atomic number, and
chemical and physical properties.
4. How it is organized
It is organized into rows and columns. Groups, Periods,
and Families.
Groups are the lines that go down.
Periods are the lines that go across.
5. What are the relationships
between elements?
In each group or family they have the same number of
valence electrons.
Elements that are in the same period have similar atomic
orbitals.
6.
7. Hydrogen (H)
Atomic Number 1
Atomic Mass 1.00794
Hydrogen can be used to power cars, and hot air ba$oons.
