Periodic Groups

Group 1A

alkali metals

Group 2A

alkaline earth metals

Group 6A

chalcogens/oxygen group

Group 7A

halogens

Group 8A

noble gases

Group 6A: chalcogens, aka:

the oxygen group

Alkali metals have low densities and:

melting points

Alkali metals have low melting points and:

densities

Alkali metals have ___ ionization energies

low

Alkali metals’ reactions with water are famously:

exothermic (picture sparks)

____ tests can be used to identify alkali metals

flame

Alkaline earth metals have ____ densities, melting points, and ionization energies than alkali metals

slightly higher

Most alkaline earth metals react readily with:

water (except Be, and Mg only reacts with steam)

Alkaline earth metal water reactivity tends to ____ as you go down the group

increase

Because the halogens of Group 7A have _____, they exist as anions in nature.

highly negative electron affinities

Because the halogens of Group 7A have highly negative electron affinities, they exist as _____ in nature.

anions

Noble gas electron affinities are positive, meaning the atom has to ___ energy to gain an e^-

absorb

Noble gases cannot form:

stable anions

Noble gases are found as ____ gases

monoatomic (only fantastic 7 are diatomic anyway)

Alkali metals tend to be more reactive than alkaline earth metals because:

alkali metals have lower ionization energies.

Which alkaline earth metal will not react with liquid water or with steam?

Be

All of the halogens form salts with ____ with the formula MX

alkali metals

Group IVA elements have 4 valence electrons. They do not gain or lose electrons. Instead, they:

share 4 electrons with other nonmetals to get octet configuration/