Mendeleev and His Periodic Table

Mendeleev organized his Periodic Table by ____ in the same way that today's Periodic Table is organized by atomic number.

• protons

• atomic mass

• neutrons

The modern Periodic Table is different from Mendeleev's in several ways. In which way are the two tables the same?

• Elements are put into columns based on similar chemical properties.

• Elements are arranged by increasing atomic number.

• The inert gases occupy one column of the table.

Mendeleev's Periodic Table lacked _____.

• noble gases

• chemical property trends

• neutrons

How does the Periodic Table used today classify elements?

• According to chemical properties alone

• According to atomic number

• According to atomic mass

The diagram shows a portion of the periodic table. Elements that were unknown during Mendeleev's time have been removed. Using Mendeleev's rules for arranging elements, which box would contain the metal gallium, which has an atomic number of 31 and an atomic mass of 70?

• Only box 3

• Either box 2 or box 3

• Only box 2

Tags

NGSS.MS-PS1-1