electron arrangement Flashcards
what is the electronic structure of helium?
2
what is the electronic structure of beryllium?
2,2
what is the electronic structure of chlorine?
2,8,7
what is the electronic structure of argon?
2,8,8
what is the electronic structure of lithium?
2,1
what is the electronic structure of sodium?
2,8,1
what is the electronic structure of fluorine?
2,7
what is a vertical column?
a group
what is a horizontal row
a period
what is common between atoms in the same group?
the number of electrons in the outer shell.
history of the periodic table - who came first?
Johann wolfgang dobereiner
what did dobereiner do?
law of triads
what years did dobereiner do this?
1780 - 1847
history of the periodic table - who came second?
John newlands
what did newlands do?
each element was similar to the element that was 8 places further on the devised periodic table
what years did newlands do this?
1837 - 1898
history of the periodic table - who came third?
dimitri mandeleev
what did mandeleev do?
the physical and chemical properties of an element were related to its relative atomic mass.
what years did mandeleev do this?
1834 - 1907
atoms in the same period have the same number of ..
energy levels
what is the appearance of metals?
shiny ( metallic luster )
what is the appearance of non - metals?
not shiny ( dull )
does metal conduct heat?
yes
what about non - metals?
no
