Periodic Table Flashcards
Who is recognized for initially arranging the known elements of the time into a periodic table?
Mendeleev
Which of the following is the element in group 18 and period number 2
Ne
Why is Henry Moseley relevant in the history of the periodic table?
He arranged the elements based on their atomic numbers and properties
Over 80% of the elements are classified as…?
Metals
During chemical reactions, what usually happens to the atoms of alkali metals & alkaline earth metals?
Alkali metals lose 1 electrons and become ions while alkaline metals lose 2 electrons.
Why are noble gasses usually unreactive?
Their electron shells are full.
What family of elements has 8 valence electrons(outside of helium)
Halogens
During chemical reactions what generally happens to a halogens atoms?
They gain 1 electron.
In the periodic table, the element with the largest atomic radii is located…?
In the lower left
What happens to an atoms when it gains electrons?
It becomes positively charged ion called a cation.
Which electron is the first to be removed from any atom?
A valence electron.
In what part of the periodic table are the atoms with the greatest ionization?
The upper right.
The ionic radii within a group decreases from bottom to top (True or False)
True
Usually, chemical bonds involve the transfer/sharing of what?
All electrons
Generally, do non metals have a high or low electronegativities?
High
