The Periodic Table Flashcards
1
Q
Dimitri Mendeleev
A
Created the periodic table, 1869, Russian chemist, organised the elements
2
Q
Rows, periods
A
———>, horizontal
3
Q
Columns, groups
A
|
^, downwards and vertical
4
Q
Shells
A
2 on first
8 on second
8 on third
5
Q
What is an element
A
An element is a substance of only one type of atom
6
Q
Approximately how many elements are there
A
100
7
Q
What are the two groups of the periodic table
A
Metals and non metals
8
Q
What is a compound
A
Two or more elements combined chemically
9
Q
What is a mixture
A
Two or more elements or compounds not chemically combined
10
Q
What is an isotope
A
A form of an element which has the same number of protons but a different number of neutrons
