Science in English

1. Science in English

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3.

Bromine
Astatine
Br
At
Chlorine
Fluorine
F
Cl
Iodine
I

4. Chlorine

Around 1630, chlorine gas was first
synthesized.
In 1774 Carl Wilhelm Scheele wrote
a description of chlorine gas.
In 1810 by Sir Humphry Davy
chemists suggested that the gas might
be an element.
It was named from Ancient
Greek: χλωρός, translit. khlôros, lit.
'pale green' based on its colour.

5. Iodine

The elemental form was discovered
by the French chemist Bernard
Courtois in 1811.
It was named two years later
by Joseph-Louis Gay-Lussac from this
property, after the Greek ἰώδης "violet-
coloured".

6. Bromine

The element was discovered by
Carl Jacob Löwig (in 1825) and Antoine
Jérôme Balard (in 1826),
Its name was derived from
the Ancient Greek βρῶμος ("stench"),
referencing its sharp and disagreeable
smell.

7. Fluorine

The element was discovered by
French chemist Henri Moissan in 1886.
It was named by Latin
verb fluo meaning "flow".

8. Astatine

The first synthesis of the element was in
1940 by Dale R. Corson, Kenneth Ross
MacKenzie, and Emilio G. Segrè.
It was named
the Greek astatos (ἄστατος), meaning
"unstable".

9. Astatine

Symbol:
At
Address:
number 85
Appearance:
black, dark blue
State of matter:
Character:
solid crystals
astatic, radioactive
Use:
I’m dangerous.