Dmitri Mendeleev discovered and created the periodic table in 1869 by arranging the elements in order of increasing atomic mass and grouping them by their chemical properties. He arranged the elements by atomic number and placed elements with similar chemical properties below each other, even if their atomic numbers were not consecutive. The periodic table shows the similarities in chemical properties and atomic masses of elements.

1. Periodic Table
Danielle Beck
Period 2

2. Dmitri Mendeleev
Discover and created the periodic
table in 1869.
Made a chart that showed the
similarities between the chemical
properties and atomic masses of
elements.

3. Periodic Table
Arrangement
Arranged by atomic numbers. You may find that all elements
are not placed numerically by
Listed the elements together by the the atomic numbers, this is
increasing of the atomic mass. because and element may be
almost identical chemically, that
Grouped elements together by it’s
Mendeleev decided to place the
chemical properties.
element by the chemical
property
When Mendeleev discovered an
element’s chemical properties were
very similar to another element he
would place it below that element
on the periodic table.

4. Gold
Atomic Number: 79
Element Symbol: Au
Atomic Mass: 196.96657 ± 0.00004 u or about 197
Used for jewelry, watches, and coins.
Gold is the most ductile metal of all the
transitional elements.
Good conductor of heat and electricity.

5. Calcium
Atomic Number: 20
Element Symbol: Ca
Atomic Mass:40.078
Calcium is used for human and animal nutrition
and calcium pills are made for human
consumption.
Calcium is the 5th most generous element inside
the Earth’s crust.
Important to the health of plants and animals.
Is in milk.

6. Neon
Atomic Number: 10
Element Symbol: Ne
Atomic Mass:20.18
Used for neon signs, lava lamps, fluorescent
starter tubes, and gas lasers.
Discovered in 1894