Properties
History
Periodic Table
100
What happens to the Atomic Radius as the atomic # increases down a group?
What is increases
100
What was Mendeleev's original organizing principle for groups of elements in the periodic table?
Similarity of chemical and physical properties
100
When argon was discovered, it was placed on the Periodic Table between chlorine and potassium, even though the Periodic Table at the time was organized by increasing atomic mass. Why did scientists choose to place argon before potassium?
Argon would then be grouped vertically with similar elements like helium.
200
As shown by the periodic table, why do the elements potassium and sodium have similar chemical properties
They are in the same group and have the same number of electrons in the highest occupied energy level
200
Moseley changed Mendeleev's work to create the periodic table we use today by arranging the elements in order of increasing -
atomic number.
200
Which of the following chemical tests would give the strongest evidence that a sample of matter is a member of the alkali metal family?
Solubility in water test showing that it reacts violently with water
300
What was the basis of the earliest attempts to classify elements?
similar properties
300
To which chemical family does the unknown sample most likely belong?
Transition Metals
300
The noble gases include helium, neon, argon, and xenon. What do their electron configurations have in common?
In the highest occupied energy level, the s and p sublevels are completely filled
400
put the elements in Period 5 in order of increasing electronegativity
Mo, Te, Sr, In, I, Ag
Sr, Mo, Ag, In, Te, I
400
What can you conclude about the ability of noble gases to undergo ionization?
It is more difficult to remove electrons from a noble gas than it is to remove electrons from elements in other groups.
500
The arrows indicate the direction in which the trend is increasing. What periodic trend is being indicated by the arrows?
atomic radius
500
From this information, what is a reasonable estimate of the atomic radius of CI?
89 ppm