The Periodic Table Flashcards
1
Q
Who made the periodic table
A
Dmitri Mendeleev in 1869, Russian
2
Q
Groups
A
Vertical rows, eight groups numbered using Roman numerals, all elements in the same row have similar chemical properties and the same amount of electrons in the outer shell
3
Q
Group names
A
I - alkali metals
II - alkaline earth metals
VII - halogens
VIII - noble gases
4
Q
Periods
A
Horizontal rows, seven rows, first period only has hydrogen and helium, labelled n=1, n=2…
5
Q
Isotopes
A
Isotopes are atoms of the same element that have a different number of neutrons.
Same atomic numbers but different mass numbers
6
Q
The periodic table
A
The periodic table is an arrangement of elements in order of increasing atomic number
