Properties and group trends rest of chap 7 Flashcards
Metals tend to form
cations (+).
Nonmetals tend to form
anions (-).
The first ionization energies for metals are much ____ than those of nonmetals.b/c
lower, is easy to remove electrons from metals, they tend to form cations (+
metals They tend to be
lustrous (shiny), malleable (sheets), ductile (wires), and good conductors of heat and electricit
Compounds formed between metals and nonmetals tend to be
ionic
Most metal oxides function as
bases
nonmetals They tend to be
dull, brittle substances that are poor conductors of heat and electricity.
Nonmetals tend to have ______ electron affinities
very negative
Compounds formed between nonmetals and nonmetals are
molecular compunds
Most nonmetal oxides form
acids in water.
Metalloids
For instance, silicon looks shiny, but is brittle and fairly poor conductor.
Group 1A, Alkali Metals
soft, metallic solids,Largest atomic radii, very exothermic reactions
Group 1A, Alkali Metals low..
low densities and melting points.and ionization energies
Group 2A, Alkali Earth Metals compares. Alkali metals
higher densities and melting points than alkali metals.
Their ionization energies are low, but not as low as those of alkali metals.
Alkali Earth Metals Reactivity tends to increase as you go down the group what are some examples
Beryllium does not react with water and magnesium reacts only with steam, but the others react readily with water
Group 6A React vigorously with __________ and __________
Forms …
alkali and alkali earth metals
metals, metalloids, and nonmetals
Group 6A Oxides:
XO2, XO3
Allotropes are
different forms of the same element in the same physical state.
two allotropes of oxygen:
O3, O2
Sulfurs stable allotrope at room temperature is
S8
Group 7A: Halogens have high
electronegativity (electron affinity)
Group 7A: they tend to ____other elements easily.
oxidize
Group VIIIA: Noble Gases the highest and have positive
ionization energies, electron affinities
Noble Gases elements that form compunds
Xe (XeF2 XeF4 XeF6)
Kr forms only one stable compound:
KrF2
