5. giant covalent and metallic Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

what factor impacts

METALLIC BOND STRENGTH?

A

Depends on the number of outer electrons donated to the cloud and the size of the metal atom/ion.

MELTING POINT INCREASES ACROSS THE PERIOD

THE ELECTRON CLOUD DENSITY INCREASES DUE TO THE
GREATER NUMBER OF ELECTRONS DONATED PER ATOM. AS A
RESULT THE IONS ARE HELD MORE STRONGLY.

eg. The strength of the metallic
bonding in sodium is
relatively weak because each
atom donates one electron to
the cloud.

The metallic bonding in
magnesium is stronger than
in sodium because each atom
has donated two electrons to
the cloud. The greater the
electron density holds the
ions together more strongly.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

properties of

Covalent molecular structures

A

Small discrete molecules

Strong covalent bonds within molecules

Weak intermolecular forces between
molecules

Many of these structures dissolve in organic
solvents; some dissolve in water

Typical examples – CO2 , H2O, Br2, S8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

properties of

giant covalent structures

A
  • Giant repeating lattices of
    very many covalently
    bonded atoms
  • Insoluble solids with high
    melting and boiling points
  • Typical example is SiO2
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

define

Allotropes

A

Different structures of the same element are
called allotropes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what are the 4

allotropes of carbon

A
  1. graphite (makes 3 bonds)
  2. graphene
  3. buckminsterfullerene C60
  4. diamond (4 bonds)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly