The Periodic Table
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The Periodic Table. Dmitri Mendeleev. was born in Siberia (Russia) in 1834. He had 13 (maybe 17) older brothers and sisters. His father went blind when he was young,. and his mother started a glass factory to help make ends meet. As Dmitri was completing high school. his father died,.

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The Periodic Table

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The Periodic Table


Dmitri Mendeleev

was born in Siberia (Russia) in 1834.

He had 13 (maybe 17) older brothers and sisters.

His father went blind when he was young,

and his mother started a glass factory to help make ends meet.


As Dmitri was completing high school . . .

his father died,

and the glass factory burned down.


All her other children were grown, so Mrs. Mendeleev took Dmitri to St. Petersburg and worked to get him through college.


10 Ne neon

Atomic Wt.

In 1860, when he was 26, Dmitri began working on a first edition chemistry text book.

He organized material for his book on note cards.

For each known element, Dmitri wrote the atomic mass on each card and some properties.


1 H hydrogen

Atomic Wt.

2 He helium

Atomic Wt.

3 Li lithium

Atomic Wt.

4 Be beryllium

Atomic Wt.

5 B boron

Atomic Wt.

6 C carbon

Atomic Wt.

7 N nitrogen

Atomic Wt.

8 O oxygen

Atomic Wt.

9 F fluorine

Atomic Wt.

10 Ne neon

Atomic Wt.

11 Na sodium

Atomic Wt.

12 Mg magnesium

Atomic Wt.

13 Al aluminum

Atomic Wt.

Dmitri had a file of note cards, one card for each of the 63 known elements.


Dmitri noticed patterns and trends among the elements.

He ordered elements according to increasing atomic masses.

He placed the elements into a table called the periodic table of the elements, his greatest achievement.


The Periodic Table of the Elements

He left spaces in his table where he predicted unknown elements would eventually be placed.


Ga

Ge

Sc

Mendeleev was correct.

Three of these elements were discovered during his lifetime.


All pictures of Dmitri Mendeleev show him with long, straggly hair.

He got a haircut once a year,

whether he needed it or not.


Bibliography

Kotz, John C. and Purcell, Keith F. (1991). Chemistry and chemical reactivity. Ft. Worth, Texas: Harcourt Brace Jovanovich College Publishers.

Mendeleev, Dmitri I.

http://www.wnet.org/hawking/cosmostar/html/cstars_mendel.html


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