Please enable JavaScript.
Coggle requires JavaScript to display documents.
Atoms, Elements and Compounds (Atoms (The electrons (Negatively charged,…
Atoms, Elements and Compounds
Atoms
The electrons
Negatively charged
They cover a lot of space
Move around the nucleus in shells
Atomic number and mass number describe an atom
Nucleus
In the middle of the atom
Contains the protons and neutrons
Positively charged
Number of protons equals number of electrons
The charge on the electrons is the same size as the charge on the protons
Atoms are neutral
They have no overall charge
Because they have the same number of protons and electrons
Atoms contain protons, neutrons and electrons
Elements
Elements consist of atoms with the same atomic number
The number of neutrons divides what type of atom it is
the substance can only be called an element if it has the same number of protons it can be called an element
They can have different numbers of protons, neutrons and electrons
Isotopes are the same except for extra neutrons
They have the same atomic number but different mass number
An example is carbon - 12 and carbon - 13
Isotopes are different forms of the same element, they have the same number of protons, but different neutrons
Relative atomic mass = (isotopes abundance x isotopes mass number)/ sum of abundances of all the isotopes
Compounds
Atoms join together to make compounds
Elements react, atoms combine with other atoms to form compounds
Making bonds involves atoms giving away, taking or sharing electrons
Only electrons are involved
A compound formed from non metals consists of molecules
Called covalent bonding
A formula shows what atoms are in a compound
CO2 is a compound formed from a chemical reactions
Just elements can be represented by symbols, compounds can be represented by formulas
The formulas are made up from elemental symbols in the same proportions that the elements can be found the compound