The Periodic Table Flashcards
Define: atomic mass
The average mass of an element and its isotopes.
Define: atomic number
The number of protons in the nucleus of an atom
What is the Lewis dot diagram for the element with atom number 6?
, *
* C *
*
A column of the periodic table is called a(n) ________.
group
A repeating pattern of chemical and physical properties of the elements is called _________.
periodicity
The element _______ is located in group 1, period 2.
lithium
The element ______ reacts the same way that cobalt (Co) does.
Rhodium
True/False: Halogins tend to donate electrons.
False: attract
True/False: Non-metals tend to be good insulators of heat and electricity.
True.
True/False: The transition metals tend to be highly reactive.
False: alkaline
True/False: Periods tend to have similar physical characteristics.
True.
What is the Lewis dot diagram of oxygen?
, **
* O :
*
In what ways did the original periodic table differ from the modern version?
- Old periodic table ordered the elements based on their atomic mass.
- New periodic table ordered them based on their atomic number.
- The old table has lanthasides, antices, and noble gasses missing.
Why are all of the elements in group 18 found as a gas?
All elements in group 18 have their atomic shells filled up.
Describe how valence electrons determine the reactions of an element group. Use a specific example.
The fullness of the outer shell of electrons determines an elements reactivity. An element’s group is equal to the number of valence electrons. For example, Chlorine is very reactive because it only needs one electron and is in group 7.
