Atoms, elements and compounds Flashcards
(12 cards)
Can element be broken down?
It cannot be broken down into other substances
What is atomic number Z
It’s the amount of protons in an atom
Does a atom have a charge?
No they are neutral
What is mass number A?
The total of protons and neutrons of an atom
Define isotope
Isotopes are atoms of the same element with different amount of neutrons and mass
What is the difference between atomic mass and relative atomic mass ?
Atomic mass is the mass of one atom whereas relative atomic mass is the overall average mass of isotopes of the same atom
Define relative atomic mass
Average mass of the element’a isotopes relative to 1/12 of the mass of a carbon 12
What is a compound ?
It has 2 or more elements chemically combined
What is a molecule?
Smallest part of a covalent compound or element
What is ionic compound made from ?
Ions
Define ion
Ion is formed when an atom loses or gains an electron and it gains charge
Define relative molecular mass of a compound
Sum of a compound to the relative atomic masses of all of its atoms. Also known as relative formula mass
