Periodic Table Flashcards
The elements are arranged in order of their __________ number.
Proton
The Russian Scientist, Mendeleev, left gaps in the Periodic Table for ____________ elements.
Undiscovered
The Russian Scientist, Mendeleev, ____________ the properties and mass of undiscovered elements.
Predicted
The proton number of the element iron is ____.
26
The mass number of the element oxygen is _____.
16
A row of elements in the Periodic Table is a __________.
Period
A vertical column in the Periodic Table is a __________.
Group
Elements in the same group have similar ___________.
Properties
The Group 1 elements are known as the ________ _________.
Alkali metals
The alkali metals are in Group ___ of the Periodic Table.
1
The Group 7 elements are known as the __________.
Halogens
The Halogens are in Group ___ of the Periodic Table.
7
The elements in the central block of the Periodic Table are known as the _________ _________.
Transition metals.
About ______ % of the elements in the Periodic Table are metals.
75%
