Metals and the periodic table Flashcards
Who designed the modern periodic table?
Mendeleev
How did Mendeleev arrange the elements the periodic table?
By increasing atomic mass
How are the elements in the modern periodic table arranged?
By increasing atomic number
Why did Mendeleev leave gaps in the periodic table?
For elements which had not yet been invented
What are the rows in the periodic table called?
Periods
What do the periods tell you about atoms?
How many shells of electrons the atoms have
What are the columns in the periodic table called?
Groups
What does group number tell you about atoms?
How many electrons are in the outer shell of the atom
Where on the periodic table are metals?
On the left
Where on the periodic table are non-metals?
On the right
What are the properties of metals?
High melting and boiling points, shiny when cut, malleable, ductile, good electrical conductors, high density
What does it mean if a metal is malleable?
Can be easily hammered or bent into shape
Describe the structure of metallic bonds
Rows and columns of positive ions. The outer electrons form a sea of delocalised electrons
What does it mean if the electrons are delocalised?
They leave individual atoms
Why do metals have high melting and boiling points?
There are strong forces between the positive ions and sea of delocalised electrons
