Chemical Bonding Flashcards Preview

Technology 3 - Building Science and Structures > Chemical Bonding > Flashcards

Flashcards in Chemical Bonding Deck (24):
1

Why does chemical bonding between atoms occur

Because the atoms taking part achieve a lower energy level (or greater stability)

2

The atoms taking part achieve a lower energy level (or greater stability) best describes the occurrence of

Chemical bonding between atoms

3

How does group A elements normally achieve stability through chemical bonding?

By acquiring a noble gas structure

4

By acquiring a noble gas structure will normally give stability to

Group A elements

5

For A type elements, the outer shell is called

The Valency shell

6

The Valency shell is

The outer shell for A type elements

7

What is the definition of; 'The valency of an atom'

It's defined as the number of electrons which must be lost or gained in order to achieve a completed Valency Shell.

8

What are the mechanisms that aid achievement for a Noble Gas outer Shell

Sharing Electrons
Gaining Electrons
Losing Electrons

9

Sharing Electrons, Gaining Electrons, Losing Electrons; these are all mechanisms for helping to achieve what?

A noble gas outer shell.

10

How are Covalent Bonds formed

When two atoms each contribute one electron to be shared. Each covalent bond thus consists of two electons

11

When two atoms each contribute one electron to be shared, this is the formation of what

Covalent Bonds. Each covalent bond thus consists of two electons.

12

Name some Atoms which can form multiple covalent bonds

Oxygen (2), Nitrogen (3), Carbon (4)

13

What are the Characteristics of the Covalent Bond (4)

It is specific: ie formed between two particular atoms

it is diectional: acts along a line joining the nuclei of the two atoms involved.

it leads to the formation of discrete molecules.

It is one of the strongest chemical bonds

14

What is Ionic Bonding

It's where one Atom donates one or more electrons to an acceptor so that both achieve the stable noble gas structure

15

Where one Atom donates one or more electrons to an acceptor so that both achieve the stable noble gas structure, is known as

Ionic Bonding

16

Where does Ionic Bonding commonly occur

Between metal and non metal

17

Between metal and non metal is the common occurrence place for

Ionic Bonding

18

The transfer of electrons in Ionic Bonding produces what?

Charged Atoms species known as Ions

19

Charged Atoms species known as Ions is the result of what?

The transfer of electrons in Ionic Bonding

20

What are the characteristics of Ionic Bonds

Non - Specific
Acts equally in all directions
Does not form molecules

21

What Atoms contain a very small number of weakly held valency electrons

Metal Atoms

22

How can the structure of Metal Atoms be visualised

As a cloud of electrons enveloping a number of positively charged ions, in which the mutual repulsion of the ions is balanced by the attraction of the ions to the electron cloud.

23

What are the characteristics of the Metallic Bond (5)

Non - Specific and Non - Directional
No Molecules Formed
Leads to the formation of simple crystal lattices
Electrical conductivity very high
Weakest of Primary Bond

24

Describe Van Der Waal's Bond

This is produced by the chance occurrence of a temporary, unbalanced electron distribution. This tends to induce a similar distribution in adjacent molecules. The resulting weak dipoles create attractive forces between the molecules.