Purple pen for test

Question	Answer
isotopes of an element	same number of protons / electrons, same nuclear charge different number of neutrons / nuclear masses different
size of nucleus compared to the atom	1/10.000
Reaction of atom with electromagnetic radiation	When electromagnetic radiation is absorbed the distance increases (gets larger) When electromagnetic radiation is emitted the distance decreases (gets smaller)
Charge of plum pudding model	(an equal amount of) positive charge
explanation for Marsden and Rutherford experiment	a (significant) number of alpha particles were scattered by more than 4° or alpha particles deflected backwards measurements / results could not be explained by ‘plum pudding’ model measurements / results did not support predictions many / (over)100 000 measurements / results taken scientists were respected
Beta decay	number of neutrons decreases by one number of protons increases by one
Differences between alpha and beta decay	the number of protons determines the element alpha and beta decay produce different changes to the number of protons alpha and beta decay produce different atomic numbers

Resource summary

	Created by Bernardo López Chacón almost 6 years ago