IRINA SOSELIA

The United Nations announced 2019 as the International Year of the Periodic Table of the Chemical Elements to highlight its first publication in 1869. The periodic table as we know it today was first designed by the Russian scientist Dmitri Ivanovich Mendeleev.

Pre-Periodic Table Chemistry … … was a mess!!! No organization of elements. Imagine going to a grocery store with no organization!! Difficult to find information. Chemistry didn’t make sense. 

Dmitri Mendeleev: Father of the Table HOW HIS WORKEDPut elements in rows by increasing atomic weight. Put elements in columns by the way they reacted. SOME PROBLEMS He left blank spaces for what he said were undiscovered elements. (Turned out he was right!) He broke the pattern of increasing atomic weight to keep similar reacting elements together. 

. The Current Periodic Table Mendeleev wasn’t too far off. 

Now the elements are put in rows by increasing ATOMIC NUMBER!! The horizontal rows are called periods and are labeled from 1 to 7. The vertical columns are called groups are labeled from 1 to 18. 

M A C E D O N I A

Aida Petrovska

This year marks the 150th anniversary of the first publication of the periodic table by Mendeleev. Since its creation, the periodic table has been at the centre of a lot of vivid debates and is now considered as one of the most important and influential achievements in modern science.

Element 101 was named mendelevium to honour Mendeleev’s contributions. This is actually an even rarer distinction than winning the Nobel prize: only 50 scientists have elements named after them, while 180 chemists have received a Nobel prize in chemistry.

Since the start of the 19th century, the number of known elements has steadily risen, reaching its present total of 118. Uranium (number 92) is the heaviest element present in the Earth in an appreciable amount and all successive elements have been made in scientific laboratories.

In 2016, four elements still had to be discovered according to the gaps in the periodic table. With the addition of nihonium, moscovium, tennessine and oganesson, the periodic table is now complete.

Naming 2019 as the International Year of the Periodic Table may bring the public’s attention to the importance of chemistry in our lives, stoke our curiosity for science and encourage scientists’ interest in uncovering even more elements.

R O M A N I A

IRINA TOMOIAGĂ

2019 will be the 150th anniversary since Dimitri Mendeleev discovered the Periodic System and has been proclaimed the "International Year of the Periodic Table of Chemical Elements" (IYPT2019).

The Periodic Table of Chemical Elements is one of the most significant achievements in science, capturing the essence not only of chemistry, but also of physics and biology.

1869 is considered as the year of discovery of the Periodic System by Dimitri Ivanovici Mendeleev. It is a unique tool, enabling scientist to predict the appearance and properties of matter on the Earth and in the rest of the Universe.

There are 118 confirmed elements in the periodic table. Among those, 90 elements can be found in nature, others are strictly man-made. Technetium was the first man-made element.

The elements on the periodic table are everywhere, in fact, they make up everything.

Our Chemical elements are: Fe, Cu, C and O.

TURKEY

Nevin GUVENDIK

WE celebrated Periodic Table years with my students in Istanbul University

We have designed periodic table in different models. we exhibited our periodic tables in our school.

We examined periodic table mobile applications.

Armenia, Ayntap secondary school N2

Ayntap, Armenia

Ayntap , Armenia

Azizi Thouraya

Lycee Ibn Khaldoun Rades

Dmitri Ivanovich Mendeleev

Dmitri Ivanovich Mendeleev a Russian chilist, has created a system so precise that he is still employed today. He arranged the elements according to their atomic mass, density, color melting point and other properties.

the work of my students

LATVIA

INETA LIELKALNE

Latvian students learn the history of chemical elements

Latvian students illustrate chemical elements and make games

REPUBLIC OF MOLDOVA , LLMM

RITA GODOROJA