The Periodic Table/ Groups/ Metals and Non-Metals Flashcards
Which Scientist ordered his Periodic table by Atomic weight?
John Dalton
What did John Newlands order his periodic table in terms of?
By weight and put into 8s.
What led to Mendeleev’s table being accepted
He ordered his periodic table in terms of atomic mass and grouped by properties but left gaps for undiscovered elements.
After Mendeleev, how was the periodic table arranged?
In terms of atomic number
Which two elements did Mendeleev swap around on the periodic table?
Tellurium and Iodine
Why are some elements swapped around in the periodic table?
In order to fit the properties of the groups they are in
How did the discovery of isotopes prove that mendeleev was right not to place elements in order of atomic mass?
Isotopes of the same element have different atomic masses but have the same chemical properties so occupy the same position on the periodic table.
What are the vertical columns in the periodic table called?
groups
What are the rows in the periodic table called?
Periods
What does the period number tell you?
Number of shells the element has
What does the group number tell you?
Number of electrons in its outer shell.
What are properties of metals?
Strong, Good conductors of heat and electricity, high boiling and melting points, malleable, high density
What are properties of non-metals?
Brittle , poor conductors of heat and electricity, low density
What are properties of transition metals?
Good conductors of heat and electricity, very dense, strong, shiny, can form more than 1 ion, forms coloured compounds, good catalysts.
What is the trend in reactivity in group 1?
Increasing reactivity going down the group
