Unit 1 - Topic 4 - Writing Chemical Formulae Flashcards
(51 cards)
What are all substances made up of?
Atoms
What is an element?
A substance made from one kind of atom only.
What are unreactive elements called?
Monoatomic elements
Describe monoatomic elements
Monatomic means that an element is made from single atoms that are not joined together. Group 0 are the monatomic elements.
The formulae of the monatomic elements are just their symbol.
How many diatomic molecules are there?
7
Name all the diatomic molecules
Hydrogen Fluorine Chlorine Bromine Iodine Oxygen Nitrogen
What are all group 7 elements?
Diatomic Molecules
Why is Astatine not considered a diatomic element?
Because it is a man-made element.
What are diatomic molecules?
Diatomic means a molecule made from two atoms. If both atoms in the molecule are the same, the molecule is an element.
What is a molecule?
A molecule is a group of two or more atoms, which are joined together. The smallest molecule is made from two atoms, a diatomic molecule.
How many type of molecules are there?
2
What are the different types of molecules?
Element Molecule – All the atoms in the molecule are the same type.
Compound Molecule – Different atoms are joined together.
What are bonds?
Attractive forces which hold atoms together in a molecule.
How are mixtures formed?
When different elements are put together, but they do not react and join.
How are compounds formed?
When different elements (atoms) react and join together
What is a compound?
A compound is a substance made from different atoms joined together.
How many elements do compounds ending in -ide have in them?
2
How many elements do compounds ending in -ite or -ate have in them?
3, one of which is always Oxygen
What is the combining power of an atom called?
Valency
What is the valency of an atom?
The number of bonds an atom can make.
What valency do group 1 elements have?
1
What valency do group 2 elements have?
2
What valency do group 3 elements have?
3
What valency do group 4 elements have?
4
