atomic structure Flashcards
which atomic model was the first to introduce a nucleus
rutherford
true or false
the experimental work of james chadwick provided evidence to show the existence of neutrons in the nucleus
true
true or false
atoms of the same element have the same number of protons
true
how many times smaller is a nucleus than an atom
10 000
describe a description of an atom
a positively charged nucleus surrounded by negative electrons
what is the best description of alpha radiation
helium nucleus
what is the best description of beta radiation
high speed electron
an atom described as radioactive is…
highly likely to decay and emit radiation
‘count-rate’ is the number of decays recorded by a detector per second.
true or false
true
which radiation has the longest range in air?
gamma
which radiation is the most ionising?
alpha
