Study the information in the table. Read the statements and decide whether they are true, false or not stated.

1. Dmitry Mendeleev was born on February 8, 1834, in a small Russian province. ...
2. The exact number is unknown, but it is believed that he had at least 16 brothers and sisters. ...
3. Dmitry Mendeleev had six sons. ...
4. Mendeleev released the periodic table in 1869. ...