2. The Periodic Table Flashcards
Why is it called the Periodic Table?
Because of the regularly repeating patterns in the properties of elements.
Which scientist created the Periodic Table as we know it today?
Dmitri Mendeleev
Why were there gaps in Mendeleev’s Periodic Table?
He left room for undiscovered elements that would fit in those gaps when discovered
Why are the noble gases in group 0 unreactive?
They have very stable electron arrangements
Which group are the alkali metals found in?
Group 1
What happens to the melting and boiling points as you go down group 1?
They decrease
When alkali metals react with water they produce…
hydrogen and an alkaline solution
Going down group 1, the reactivity of the alkali metals…
Increases
Which group contains the halogens?
Group 7
What compounds do halogens form by sharing electrons?
Covalent compounds
A more reactive halogen can…
displace a less reactive halogen within a reaction
Going down group 7, the reactivity…
decreases
Electrostatic attraction in an atom depends on…
the distance between the outermost electrons and the nucleus, The number of occupied inner shell or the size of positive charge on the nucleus (nuclear charge)
The ability to gain or lose an atom depends on…
the strength of electrostatic attraction
Transition elements are…
all the metals positioned in a large block in the centre of the periodic table
Physical properties of transition elements are:
-Good conductors of electricity and thermal energy
-Hard and Strong
-High density
-High melting points
Transition elements do not…
react vigorously with oxygen or water
Transition elements and their compounds are…
important industrial catalysts
