Introduction to the Periodic Table

Development of the Periodic Table

                 Emade coins and jewelry from gold and silver. They also made tools and weapons from copper, tin, and iron. In the nineteenth centuryarly civilizations were familiar with a few of the substances now called elements. They , chemists began to search for new elements. By 1830, they had isolated and named 55 different elements. The list continues to grow today.

Dmitri Mendeleev published the first version of the periodic table in 1869. Mendeleev left three gaps on the periodic table for missing elements.

Moseley arranged Mendeleev’s table according to atomic number, not by atomic mass.

Today’s Periodic Table

• The periodic table is divided into sections.

• A period is a row of elements whose properties change gradually and predictably.

• Groups 1 and 2 along with Groups 13–18 are called representative elements.

• Groups 3–12 are called transition elements.



One thought on “Introduction to the Periodic Table

  1. […] Introduction to the Periodic Table ( […]

Tinggalkan Balasan

Isikan data di bawah atau klik salah satu ikon untuk log in:


You are commenting using your account. Logout /  Ubah )

Foto Google+

You are commenting using your Google+ account. Logout /  Ubah )

Gambar Twitter

You are commenting using your Twitter account. Logout /  Ubah )

Foto Facebook

You are commenting using your Facebook account. Logout /  Ubah )

Connecting to %s