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types of crystalline solids (10 A (Noura, Fatima, Rawan, Sarah Al Mansour)…
types of crystalline solids
molecular
unit particles: molecules
characteristics : fairly soft - vary low melting points - poor conductivity
example: oxygen atom (H2O)
Ionic
Characteristics of Solid Phase
hard; brittle; high melting points; poor conductivity
Examples
NaCl, KBr, CaCO3
Unit particles: ions
Covalent network
Characteristics of Solid Phase
very hard; very high melting points; often poor conductivity
Examples
diamond (C) and quartz (SiO2)
Unit Particles
atoms connected by covalent bonds
Atomic
unit particles
atoms
characteristic of solid phase
soft to very soft, low melting points, poor conductivity
Examples
group 18 elements
Metallic
Characteristics of Solid Phase
soft to hard; low to very high melting points; malleable and ductile; excellent conductivity
Examples
all metallic elements
Unit Particles
atoms surrounded by mobile valence electrons
10 A
Noura
Fatima
Rawan
Sarah Al Mansour