The Periodic Table Flashcards
Mass number
The total number of protons and neutrons
Atomic number
The number of electrons
Metals
Are on the left side of the periodic table.
Non-metal
On the right side of the table
Group number
The name of the columns
Period numbers
Horizontal rows
What can we say about the group number and the electrons in the outer shell?
Group number in the same as the number of electrons in the outer shell.
The period number tells us the number of shells of electrons
The size of the atoms increase down a group.
Li= 2,1
Ne=2,8,1
K= 2,8,8,1
Group 1
Contains the most reactive metals.
Called alkali metals.
That each have one electron in the outer shell.
As the group is descended the alkali metals become more reactive.
Fr is the most reactive metal.
Group VII/ 7
Most reactive non-metal.
Known as halogens.
Descended the halogens become less reactive.
F is the most reactive non-metal.
Group O/ 8
Unreactive non-metal.
Known as the Nobla Gases.
They do not react because they have a fupp outer shell of electrons.
Transition metals
The block of metals between group 2 and 3.
They form coloured compounds and are generally unreactive metals.
Metals/ non-metals
Moving across a period the elements change from metals to non-metals.
Metals found on the left of stepped line.
Non-metals are found on the right of the stepped line
Hydrogen is a non-metal.
Semi-metals
Silicon (S) and Germanium (Ge).
Shows properties of metals and non-metals.
Conducts SMALL amounts of electricity.
Carbon (graphite)
Non-metal that conducts electricity.
