1d - the periodic table Flashcards
Describe the properties of noble gases.
Non-metals, colourless gases at room temperature, low boiling points, unreactive
Discuss the trends in properties down the group. (noble gases)
The boiling point increases down the group, as the atoms get heavier.
The columns of the periodic table are called…?
Groups
The rows of the periodic table are called…?
Periods
Are elements in the same group similar or different?
They may have similar chemical properties, as they have the same number of outer shell electrons.
In terms of energy levels, what are the differences between elements of the same period?
They have the same number of energy levels
The elements of Group 0 are more commonly known as…?
The noble gases
What makes the periodic table periodic?
Similar properties of elements occur at regular intervals
Elements in the same group have the same number of electrons in their outer shell; what does this tell us about their chemical properties?
They have similar chemical properties
In terms of shells, what is the difference between elements in the same period?
They have the same number of shells
What change in shell number is seen as one moves down a group?
The number of shells increases
Early periodic tables were incomplete and elements were placed in inappropriate groups if what was to be followed?
The strict order of atomic weights
Knowledge of what made it possible to explain why the order based on atomic weights was not always correct?
Isotopes
Mendeleev overcame some problems with the table by doing what? He also changed the order of some elements based on what?
Leaving gaps; atomic weights
The majority of elements are…?
Metals
Elements that react to form positive ions are…?
Metals
Elements that do not form positive ions are…?
Non-metals
Elements in Group 1 are known as…?
The alkali metals
Elements in Group 7 are known as…?
The halogens
true or false?
the number of electrons in an atom changes during chemical reactions
true.
the number of electrons in an atom changes during chemical reactions
what do periods in the periodic table indicate?
the number of electron shells in an atom
how are elements arranged in the periodic table?
elements are arranged by increasing atomic number in periods and groups
true or false?
each element has one proton more than the previous one.
true.
what do groups in the periodic table indicate?
groups indicate the number of outer electrons in an atom
what is an electronic configuration?
the arrangement of electrons in shells
what is the max number of electrons in the first shell?
2 electrons
what info does the group give about electronic config
the number of outer electrons
what is the max number of electrons in the second and third shells?
8 electrons
true or false?
most elements have full outer shell or electrons
false
