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Most of the mass of an atom is located in the n_____
nucleus
Everything in our world is either e_____ or a_____.
Energy or atoms (matter)
Electrons have a mass of almost _____.
zero
When the nucleus of an atom has too many protons and neutrons, it is un___ and r____.
unstable and radioactive
The atomic number tells us how many ______ and _____ the element has.
Protons and electrons
If an element has an atomic number of 5 and an atomic mass of 12, how many neutrons does it have?
7
There are _____ types of atomic radiation.
three
A particle made of two protons and two neutrons and no electrons is known as an....
alpha particle
When an electronic is given off by an unstable nucleus, it is known as a b____ p_____.
beta particle
The most dangerous type of ionising radiation is _______ radiation.
Gamma radiation.
________ can be stopped by a piece of paper because they are heavy.
Alpha particles
Alpha particles have a ______ charge.
positive
Beta particles have a ______ charge.
negative
_______ radiation is energy, and so is unaffected by magnets.
Gamma
The atomic mass is the weight of all the _______ and _______ in an atom.
Protons and neutrons
Protons and Neutrons have an atomic mass of _____.
1
