Elements, molecules, lattices, compouds Flashcards
What is an element?
An element is a substance made up of just one type of atom. They can be a single atom or made up of molecules, and they can not be broken down into smaller pieces.
The group number an element is in tells us how may valance/ outside shell electrons an element has.
What is a molecule?
A molecule is a group/cluster of 2 or more atoms bonded together, when all the atoms are non-metals, they can be the same or different. Diatomic molecules contain 2 atoms that are the same.
What is a lattice?
A lattice is a three-dimensional arrangement of points, particles, or atoms that forms a grid-like structure.
How can atoms of elements can be found in different structures including as single atoms, molecules and lattices?
Atoms of elements can exist as single atoms, molecules, or arranged in lattices. This depends on factors like bonding and conditions such as temperature and pressure.
What is a compound?
A compound is the substance produced when two or more elements combine in a chemical reaction. They can be very small (2 atoms) or very big (billions of atoms). All compounds are molecules, but not all molecules are compounds. Compounds are always made up of different types of atoms, whereas elements are always made up of the same type of atom.
What are chemical formulas?
Chemical formulas are short codes that show what elements a substance is made of and how many atoms of each element are present. For example, H2O represents water, showing that it has two hydrogen atoms and one oxygen atom.
Recognise that elements and simple compounds can be represented by symbols and formulas
In a chemical formula, we use the elemental symbols from the periodic table to indicate which elements are present, and we use subscripts to indicate how many atoms of each element exist within the molecule. For example, a single molecule of NH , ammonia, contains one nitrogen atom and three hydrogen atoms.
