Periodic table Flashcards
Organisation, who created it when why is it different from other periodic tables (6 cards)
1
Q
What are the diatomic elements
A
The 7 diatomic elements are Hydrogen, Nitrogen, Oxygen, FLuorine, Chlorine, Bromine, Iodine
2
Q
What is different about the diatomic elements
A
They do not like to be alone. They bond in pairs of two forming diatomic molecules. E.g. O2, H2
3
Q
What is a chemical formula
A
A chemical formula is a collection of symbols and numbers representing the number of atoms in an element or compound.
4
Q
What is a symbol
A
An abbreviation based on the element’s name. Example- H- Hydrogen, He for Helium
5
Q
Who made the periodic table? What makes his table different to others
A
Dmitri Mendeleev, was a Russian scientist in 1869. His periodic table was the first to accompany uninvented elements.
6
Q
What patterns are found in the periodic table
A
- Increasing atomic numbers in rows (periods)
- In a column (group), elements have similar properties.
