Students at Primary school Branko Radicevic in Smederevo, Serbia participated in an eTwinning project where they determined their associated chemical element based on a formula using their date of birth. The students then provided information on the properties and history of their assigned chemical element to create a chemical tree showing the relationships between elements. Elements described included thulium, iron, samarium, iridium, tin, mercury, gallium, calcium, palladium, beryllium, and barium.

1. Primary school Branko Radicevic,
Smederevo, Serbia

2. All eTwinning project participants from different countries
will determine their chemical elements, according a
formula and date of birth.
The formula that relates the exact date of birth of a
person with a number of the chemical element is:
where N - is the number of the chemical element in the
Periodic Table;
x - day of birth (1 to 31);
y - birth month (1 to 12);
z - the penultimate digit of the year of birth (0 to 9);
u - the last digit of the year of birth (0 to 9).
N =
1200𝑥+10𝑦+𝑧+120𝑢−1210
400
+1

3. Primary school
Branko Radicevic
Sladjana Rankovic The Chemical tree

4. Primary school
Branko Radicevic
Named after "Thule", an ancient name for
Scandinavia.
 Thulium is the least abundant
of the earth elements, and is
about as rare as silver, gold, or
cadmium.
 The pure metal has a bright,
silvery lustre. It is reasonably
stable in air, but the metal must
be protected from moisture. The
element is silvery-grey, soft,
malleable, and ductile, and can
be cut with a knife.

5. Primary school
Branko Radicevic
Jana Kostic The Chemical tree

6. Primary school
Branko Radicevic
 Ferum in Latin, Eisen in
German, Iron in English,
means power, strength. Iron
has been known since ancient
times. It is present in
everyday life. It is dark grаy,
reactive transition metal
which is susceptible to
corrosion. Iron is located in the
center of the Earth, in volcanic
rocks and in the human
bodies.

7. Primary school
Branko Radicevic
Kristina Spasic The Chemical tree

8. Primary school
Branko Radicevic
 Samarium is a chemical element with
symbol Sm and atomic number 62. It is
a moderately hard silvery metal that
readily oxidizes in air. It is a typical
member of the lanthanide series,
 The major commercial application of
samarium is in samarium-cobalt
magnets, catalysis of chemical
reactions, radioactive dating and an X-
ray laser.

9. Primary school
Branko Radicevic
Teodora Katic The Chemical tree

10. Primary school
Branko Radicevic
 Iridis- rainbow, It was
named after its
colored compounds.
It’s a silvery white
metal, which when
added to other
substances makes
they sparkle. It can be
found in touch
screens phones and
tablet computers.

11. Primary school
Branko Radicevic
Veljko Maksimovic The Chemical tree

12. Primary school
Branko Radicevic
 Kali- the name comes from a word which
refers to the name of the port in Malaya
from which Tin was exported in large
quantity. Tin is too soft, dark silver metal,
which melts at a relatively low
temperatures, and it easily converts into a
powder below 13 degrees. This is a very
usefull metal because it serves to protect
other metals from corrosion. Tin is a part of
Bronze alloy.

13. Primary school
Branko Radicevic
Bogdan Zlatanovic The Chemical tree

14. Primary school
Branko Radicevic
 The other name for Mercury is “Liquid silver”. It was
also named after the messenger of the gods -Mercury. It
is a grey, liqid metal, easy to evaporate, toxic and
deadly. It is accumulated in the bodies of animals,
particularly fish that swim in the water wich Mercury
pollutes. Mercury attacks the nervous system of those
who eat contaminated fish. Alchemists mistakenly
thought that they could use Mercury to turn the other
base metals into gold. Mercury used to be used in
mining, dental fillings and thermometres. Nowadays,
it is rarely used because of its toxic effects.

15. Primary school
Branko Radicevic
Staša Banjanin The Chemical tree

16. Primary school
Branko Radicevic
Named after the roman God
Mercury, greek God Hermes
 Mercury was found in
Egyptian tombs that date
from 1500BC. China and
Tibet mercury use was
thought to prolong life,
heal fractures, and
maintain generally good
health, although it is now
known that exposure to
mercury vapour leads to
sertious adverse health
effects.

17. Primary school
Branko Radicevic
Jana Radosevic The Chemical tree

18. Primary school
Branko Radicevic
Iridis- rainbow, It was named after its
colored compounds. It’s a silvery white
metal, which when added to other
substances makes they sparkle. It can be
found in touch screens phones and tablet
computers.

19. Primary school
Branko Radicevic
Kristina Aleksic The Chemical tree

20. Primary school
Branko Radicevic
“ Barus” is latin word that means
heavy. It is an alkali earth metal,
very reactive. Barium colours the
flame green, and it is used to
make flares and fireworks.

21. Primary school
Branko Radicevic
Milan Stojanovic The Chemical tree

22. Primary school
Branko Radicevic
 Solid gallium is a blue-gray metal with
orthorhombic crystalline structure; very
pure gallium has a stunning silvery
color. Gallium is solid at normal room
temperatures, but as well as mercury,
cesium, and rubidium it becomes liquid
when heated slightly. Solid gallium is
soft enough to be cut with a knife. It is
stable in air and water; but it reacts with
and dissolves in acids and alkalis.

23. Primary school
Branko Radicevic
Nevena Kojic The Chemical tree

24. Primary school
Branko Radicevic
Mercury metal has many uses. Because of its high density it
is used in barometers and manometers. It is extensively used
in thermometers, thanks to its high rate of thermal expansion
that is fairly constant over a wide temperature range. Its Its
ease in amalgamating with gold is used in the recovery of
gold from its ores. liquid
Industry uses mercury metal as a electrode in the
manufacture of chlorine and sodium hydroxide by
electrolysis of brine. Mercury is still used in some electrical
gear, such as switches and rectifiers, which need to be reliable,
and for industrial catalysis. Much less mercury is now used
in consumer batteries and fluorescent lighting, but it has not
been entirely eliminated.

25. Primary school
Branko Radicevic
Marija Vuckovic The Chemical tree

26. Primary school
Branko Radicevic
 “Calx” – means lime, It is very
important and widespread
alkaline earth metal, gray, very
soft, and reactive to water and
oxygen, biogenic element. Its
compounds can be very strong.

27. Primary school
Branko Radicevic
Dejana Popovic The Chemical tree

28. Primary school
Branko Radicevic
Named after asteroid Palas, a greeks Greek goddess of wisdom,
Athena Paladis
 Palladium is found as the free metal
associated with platinum and other
platinum group metals
 Palladium is a lustrous silver-white metal. It
has a face-centered cubic crystalline
structure, at ordinary temperatures it is
strongly resistant to corrosion in air and to
the action of acids. It is attacked by hot
acids, and it dissolves in aqua regia. It
forms many compounds and several
complex salts. Palladium has a great ability
to absorb hydrogen

29. Primary school
Branko Radicevic
Milena Ristic The Chemical tree

30. Primary school
Branko Radicevic
Beryllium is a toxic bivalent element, steel gray,
strong, light-weight, primarily used as
hardening agent in alloys. Beryllium has one of
the highest melting points of the light metals. It
has excellent thermal conductivity, is
nonmagnetic. Beryllium is used as an alloying
agent in the production of beryllium-copper.
Beryllium is not an element that is crucial for
humans; in fact it is one of the most toxic
chemicals we know. It is a metal that can be very
harmful when humans breathe it in, because it
can damage the lungs and cause pneumonia.

31. Primary school
Branko Radicevic
Vanja Dinic The Chemical tree

32. Primary school
Branko Radicevic
 Tin is a chemical element with symbol
Sn (for Latin: stannum) and atomic
number 50. It is a post-transition metal in
group 14 of the periodic table. It is obtained
chiefly from the mineral cassiterite, Tin
shows a chemical similarity to both of its
neighbors in group 14, germanium and
lead
 Tin is the 49th most abundant element
and has, with 10 stable isotopes, the largest
number of stable isotopes in the periodic
table, thanks to its magic number of
protons

33. Primary school
Branko Radicevic
Nevena Stevanovic The Chemical tree

34. Primary school
Branko Radicevic
 Barium is a soft silvery metallic alkaline
earth metal. Because of its high chemical
reactivity, barium is never found in nature as
a free element. The silvery-white color of
barium metal rapidly vanishes upon oxidation
in air yielding a dark gray oxide layer.
Barium has a medium specific weight and
good electrical conductivity.
 Barium is chemically similar to magnesium,
calcium, and strontium, but even more
reactive.