chemistry basics Flashcards
what are the groups in the periodic table?
columns numbered (1,2,3,4,5,6,7,0).
what can the group tell you about the electrons in an atom?
how many electrons their are in the outer shell like carbon is in group 4 so has 4 electros in the outer shell.
what can the periodic table tell you about the electron in an atom
how many shells an atom has like carbon is in the second period so it has two shells.
what are periods in the periodic table?
the rows.
in the modern periodic table how are atoms arranged?
by their atomic number and in groups according to their chemical properties
why do elements in the same group have simular properties?
because they have the same number of electorons in their outer shell.
why did mendeleev leave gaps in his periodic table?
for elements that hadnt been discovered yet.
where are the metals on the periodic table found?
To the left and bottom of the periodic table.
what name is given to the elements in group 0?
Noble gasses.
why are the group 0 elements so unreactive?
They gave full outer shells so do not need to lose or gain electrons.
How does the boiling points of group 0 change down the group?
increase down the group.
Explain why the group 1 elements are called alkali metals?
They are metals that form alkalis when they react with water.
what are the products of the alkali metals in a reaction with oxygen,water,halogens?
oxygen:Metal oxide
Water:metal hydroxide +hydrogen
Halogen:Metal halide
Explain why group 1 elements get more reactive down the group.
More electrons,more shielding,weaker electrostatic from the nucleus to the outer shell,easier to lose an electron.
what is the name of the elements in group 7?
halogens.
