ch. 18 Flashcards
What group of elements is stable?
Noble gases
Why do atoms lose or gain electrons?
to make it more stable
In an electron dot diagram the symbol of the element represents what? What do the dots represent?
valence electrons
when are the atoms/elements stable?
when they habve 8 valence electrons
Ionization energies tend to do what in the periodic table?
increases left to right, decreases top to bottom
what is an ionic bond
transfer of electrons
what is an anion? what is an cation?
negative charge ( flouride), positive charge (sodium No+1)
what does the subscript number indicate in a formula?
how many of it are there
what are the properties of an ionic bond?
tendency to shatter
when 2 attoms of the same element combine what is forme?
diatomic molecule
in a structural formula the dash represents what kind of chemical bond? (H-H)
single colvalent
how do you write the structural formula between 2 hydrogen atoms as a triple bond?
HEH
what is a polar covalent bond?
electrons not shared equally
what shape are the molecules in a polar bond?
bent
during a covalent bond how are the electrons distributed between 2 atoms
evenly
what grp of elements is most likely to form more than one type of ion?
transition metals
when writing the name of a formula/compound which elemet changes its suffix to ide (Ex. NaCl)
chloride
what does a Roman numeral represent in a formula?(Ex. Iron (II) oxide)
ions charge
alkali metals, alkaline earth metals, and aluminum all form ions with positive charges = to what?
group number
in carbon dioxide, the prefix in the 2nd word indicates
it contains 2 oxygen atoms
the compound with the formula SiCl2 is called what
silicon chloride
LLOY that contains mainly iron and carbon is what
steel
between potassium and bromine which on would be more reactive and why
potassium bc it gives electrons
what 2 properties of metals describes the structures of metals
conductivity and malleability
