Atomic Structure Flashcards
Element definition
Substance made up of only one type of atom
Compound definition
2 or more different elements chemically bonded together
Molecule definition
2 or more non metals chemically bonded together
Mixture definition
2 or more substances not chemically bonded together
What type of boiling/ melting point will a pure substance have?
Fixed
What type of boiling/melting point will a mixture have?
Over a range of temperatures
Atom definition
Smallest part of a substance that can not be broken down
Position of protons
Nucleus
Relative mass of a proton
1 amu
Charge of proton
+1
Position of neutron
Nucleus
Relative mass of neutron
1 amu
Charge of neutron
0
Position of electrons
Shells
Charge of electron
-1
Relative mass of electron
1/2000 amu
Atomic number meaning
Number of protons
Atomic number of oxygen
8
Mass number definition
Total number of protons and neutrons in an atom
Oxygen mass number
15.999
Isotope meaning
Atoms of an element with the same number of protons but a different number of neutrons
Relative atomic mass definition
Average mass of all the atoms of that element
Formula for calculating relative atomic mass
(Mass of isotope x abundance of isotope) + (mass of isotope x abundance of isotope)/ 100
How are elements ordered by atomic number in the periodic table
Increasing
Horizontally
