Presentation on theme: "Building Blocks 1d Int 2 1234 567 89 10 111213 14 15 22 23242526 161718192021."— Presentation transcript:
Building Blocks 1d Int 2 1234 567 89 10 111213 14 15 22 23242526 161718192021
Why do atoms form bonds? To achieve a stable electron arrangement
Are electrons transferred or shared in a covalent bond? Electrons are shared
What holds the atoms together in a covalent bond? The two positive nucleus attract the shared pair of electrons. - - shared pair of electrons + +
Which type of atoms form covalent bonds. Non-metal
Is a covalent bond a strong or weak force of attraction? Strong
Which type of bond is formed when the attraction of the non-metal atoms for the bonded electrons is different? Non-polar covalent
Are the covalent bonds in water highly polar or non polar? Highly polar- hydrogen and oxygen have different attractions for the bonded electrons. H H O
When is an ionic bond formed ? When a metal combines with a non-metal
Do metals lose or gain electrons? Metals lose electrons Group 1 - lose 1 electron Group 2 - lose 2 electrons Group 3 - lose 3 electrons.
What is formed when a metal loses electrons? Positive ion X + Group 1 form X + Group 2 form X 2+ Group 3 form X 3+
Do non-metal atoms lose or gain electrons? Gain electrons Group 5 gain 3 Group 6 gain 2 Group 7 gain 1
What is formed when a non- metal atom gains electrons? Negative ion Y - Group 5 form Y 3- Group 6 form Y 2- Group 7 form Y -
What is formed when there is a force of attraction between oppositely charged ion? An ionic bond
Which type of attraction exists in metals? Metallic bonding
What is metallic bonding? A force of attraction between positively charged ions and delocalised electrons in a metal.
Which of the following are covalent compounds? Sodium chloride, potassium fluoride, nitrogen dioxide, iron oxide, sulphur dioxide Nitrogen dioxide and sulphur dioxide (compounds made up of non-metal atoms)
What is a molecule? A group of atoms held together by covalent bonds.
What is meant by diatomic? Two atoms joined together
Name the diatomic elements? hydrogen H 2, nitrogen N 2, oxygen O 2, fluorine F 2, chlorine Cl 2, bromine Br 2, iodine I 2
Is carbon monoxide or carbon dioxide a diatomic compound? Carbon monoxide CO (2 atoms) - carbon dioxide CO 2 is a molecule made up of 3 atoms.
Draw a diagram to show the shape of a tetrahedral molecule?
What name is given to the shape of this molecule? Tetrahedral shape
Are the bonds between covalent molecules stronger or weaker than the covalent bonds within molecules? Weaker H H O H H O weak strong
Which type of substances exist as a lattice structure? Covalent network - a giant lattice of covalently bonded atoms. Ionic - a giant lattice of oppositely charged ions. Metals - a giant lattice of positively charged ions and delocalised electrons
What does the formula for a covalent network substance and an ionic compound give? The simplest ratio of atoms of each element - covalent network The simplest ratio of positive to negative ions - ionic compound
What does the formula for a discrete covalent substance give? The actual number of atoms in each molecule
Building Blocks 1d Int 2 123 4567 89 10 111213 14 15 22 23242526 161718192021