Overall science study Flashcards
Atom
Basic units of matter
Element
A substance that cannot be broken down into another substance
Proton
A subatomic particle with a positive electric charge. In the nucleus
Protons mass
1u
Neutron
A subatomic particle with no charge. In the nucleus
Neutrons mass
1u
Electron
A subatomic particle with a negative charge. Orbits around nucleus
Atomic number
How many protons are in the nucleus of an atom
Electrons mass
0.0005u
Mass number
neutrons + protons
Atomic mass
The total mass of particles of matter in an atom
Electron shell
Regions surrounding the atomic nucleus containing a specific number of electrons.
Periods
The horizontal row on the periodic table, there are 7 = same number of energy shells
Groups/family
The vertical columns on the periodic table. Group number = number of valence electrons
Which family of elements do we skip when labelling the groups of the periodic table?
Transition metals