Metal and Non - metals - Intro, overview/meaning Flashcards
(63 cards)
Total known elements?
115
Elements are divided into? on the basis of?
Metals and Non - metals on the basis on their properties
define malleable
can be beaten with a hammer to form thin sheets w/o breaking
define ductile
can be stretched/drawn to form thin wires
define brittle
breaks on hammering/stretching
chemical Properties of metals -
elements that conduct heat and electricity
metals are ->
malleable and ductile
physical properties
lustrous, hard, strong, heavy, sonorous
example of metals
iron, au, ag, cu, na, k, ca, mg
exception of state
all are solid except mercury -> liquid
during rxn metals form? by?
+ve ions, losing electrons
metals definition chemically
elements (except hydrogen) which form +ve ions by losing/donating electrons ex - AL3+
Metals are called ———– elements
electropositive elements
most abundant metal in earths crust?
al (7%), iron (4%), ca, na, k, mg
properties of non metals ->
x conduct heat/electricity, x malleable/ductile -> brittle, x lustrous -> dull appearance, x sonorous, x strong -> soft
ex of non metals
carbon, sulphur, phosphorus, silicon, H, O2, N, Cl, Br, Iodine, He, Neon, Argon
carbon impt ex -
2 allotropic forms of carbon -> diamond, graphite
total non metals and their divisions -
22, solids -> 10, liquid -> 1 - bromine, gases -> 11
During rxn non metals form? by?
-ve ions by gaining electrons
exception of electrons in non metals?
hydrogen -> losses electrons to form +ve ions
How cn u say non metals are impt?
for lyphie -> carbon compounds form life
how is o2 impt?
saasein + combustion
nitrogen is —— gas? impt?
inert gas, reduces rate of combustion making life safer
how is Sulphur impt?
hair, onion, garlic
