Atoms,elements and compounds Flashcards
What is an element?
A substance that contains atoms of only one type
feature of an element
they cannot be broken down
what are atoms?
smallest part of an element that has the properties of an element
what are molecules?
molecules are two or more atoms bonded together
types of molecules:
molecule of an element: a molecule that contains atoms of the same element. eg: H2 molecule / O2 molecule
molecule of a compound: a molecule that contains atoms from two or more elements. eg: H2O molecule / CO2 molecule
what is a compound:
A compound is a substance containing atoms of different elements combined together.
What do elements and compounds come under?
Molecules
What is an ion?
An ion is a species consisting of two or more atoms joined together having a positive or negative charge
what are the types of ions?
cation - Positive ion
Anion - Negative ion
What is mono atomic ?
made up of single atoms.
mono atomic elements: are elements made up of single atoms (He)
mono atomic ions: are ions made up of single atoms (Cl-)
What is diatomic ?
Made up of two or more atoms
diatomic elements: are elements made up of two atoms. (N2/O2)
diatomic ions: are ions made up of two atoms (OH-/HO-)
What is poly atomic ?
made up of several atoms.
Poly atomic elements: are elements made up of several atoms. (P4/CH4)
Poly atomic ions: are ions made up of several atoms.(SO4 2-)
