group chem Flashcards
to understand periodic table terms:)
what is the periodic table?
an arrangement of elements in periods and groups in order of increasing atomic number.
metallic character ___________ as you move across the periods
decreases
metallic character __________ as you move down a group
increases
what type of bonding takes place in non-metals?
covalent
non-metals are _____ conductors of electricity
poooor
metals are _____ oxides
basic
non - metals are ____ oxides
acidic
what are physical properties?
like what physical properties are in general
characteristics that are observed or measured without changing its chemical composition
(melting and boiling point, density, colour, solubility, conductivity)
what are chemical properties?
how a substance reacts with other substances to form new products
(flammability, reactivity, oxidation, decomposition under heat)
what are group 1 known as?
alkali metals
group 1 get more reactive as you go _____ the group
down
group 1 elements get softer and denser as you move ____ the group
down (except Na and K)
SSCL
what are the physical properties of group 1 elements?
- S oft and easy to cut
- S hiny lustre when freshly cut
- C onduct heat and electricity
- L ow melting points and densities (all!!)
why do group 1 elements share similar properties?
bc they all have one electron in their outer shell
what are the chemical properties of alkali metals?
- react readily w oxygen
and water vapour in air
what are the colors of halogens? (Cl, Br, and I)
Cl2 - pale, yellow-green gas
Br2 - red-brown liquid
I2 - grey-black solid
what are group 7 elements also known as?
halogens
colour and physical state
what are the physical properties of halogens?
- C olour becomes darker as you go down
- P hysical state changes as you go down
BSRD
what are the chemical properties of halogens?
bp., mp, shells of e-, reactivity, density (increase as you go up)
- B p. and mp. increases as you go up
- S hells of e- decrease as you go up
- R eactivity increases as you go up
- D ensity increases as you go up
what do transition metals consist of?
group 2 through group 3
SHCM
what are the physical properties of transition metals?
lustre, strength, conduct (?), mp.
- S hiny lustre
- H ard and strong
- C onduct heat and electricity
- M elting points (high)
HCC
what are the chemical properties of transition metals?
- H igh densities
- C oloured compounds
- C atalysts as elements in cpds.
what are group 8 elements known as?
noble/inert gases
what are the noble gases properties?
monoatomic, colorless gases
why are noble gases unreactive?
because they all have full outer shells, making them extremely stable and unreactive
