If you can do all the things listed below, you are ready for the Unit 4 test.
Place a checkmark next to each item that you can do! If a sample problem is given, complete it as evidence.
Thomson’s Model: plum pudding model
Rutherford’s Model: nuclear model; empty space model
What it looked like:
hard sphere ---> plum pudding ---> empty space ---> electron shell ---> modern model
Atoms are electrically neutral because the number of __protons___ is
mass number – the total number of protons and neutrons in an atoms
atomic number – the number of protons in an atom; defines which element the atom is
How many protons are in an atom of silicon? 14
isotope – each of two or more forms of an element that have the same number of protons, but a different number of neutrons giving each different form a different mass
ion – an atom that has lost or gained electrons
cation – a positively charged ion that results from the loss of electrons
anion – a negatively charged ion that results from the gaining of electrons