The Periodic Table Flashcards
Name three scientists that helped to create the periodic table.
Newland, Mendeleev and Mosley
What were three things that Mendeleev did?
Arranged the elements according to atomic mass, left spaces for new elements that had not yet been discovered, predicted the properties that the missing elements would have and arranged the elements in groups of eight (like Newland)
How did Mosley arrange the elements in the periodic table?
By atomic number (proton number) as well as by physical and chemical properties
What helped Mosley to discover what order the elements fitted in?
Rutherford’s discovery of the model of the atom and the invention of the x-ray
How would scientists at the time share their ideas?
They would publish their results in books or scientific journals, also, since many were still at university they would hold lectures
What was wrong with Newland’s organization of the elements?
Sometimes two elements were placed in a box and there were no spaces left for any undiscovered elements
How are the elements arranged in the periodic table?
By atomic number
What does the group number tell you?
The number of electrons on the outer shell
What does the period number tell you?
The number of shells on the atom
What is the symbol equation for lithium reacting with water to make lithium hydroxide?
Li + H2O = LiHO + H
What group are the alkali metals
Group 1
What group are the halogens?
Group 7
Why is francium the most reactive alkali metal?
The electrons on the outer shell of francium are further away than the other alkali metals,so there is less attraction between the electrons on the outer shell of francium with the nucleus, which makes it easier for francium to loose the electron on its outer shell to get a full outer shell
List three properties of transition metals
Usually good conductors of heat and electricity Are usually strong Are usually malleable Are usually ductile Are usually dense Usually have high melting points
List five transition metals and a use for each of them
Iron- Used to make steel
Titanium- Used for pipes in nuclear power stations
Nickel- Used to make steel
Mercury- Used in thermometers
Copper- Used in wires
Zinc- Used to prolong lives of other metals
