Most of the mass of at atom is in the tiny ____ at the centre. ____ orbit around the nucleus and are negatively charged. The nucleus contains ____ which are positively charged and ____ which have no electrical charge. Protons and neutrons are known as nucleons, because they are found in the nucleus. The number of protons in the nucleus is the ____. This determines what ____ the atom is. When the nucleus of an atom is ____, it can become more stable by emitting (giving out) nuclear ____. There are 3 types of nuclear radiation: alpha beta and gamma An atom is ____ when the number of positively charged ____ in the nucleus is equal to the number of ____ charged electrons orbiting the ____. If an atom looses or gains an electron it becomes a charged particle called an ____. Gaining an electron makes it a negatively charged ion and losing an electron makes it a ____ charged ion. Nuclear radiation can cause ionisation. This can happen when ____ are knocked off atoms when they are struck by nuclear ____. For example, an alpha particle released from a radioactive nucleus could hit a nearby atom causing it to lose an electron and become a ____ ion. This process is called ____. Alpha particles are ____ ionising, beta particles are ____ ionising and gamma radiation is ____ ionising. Nuclear radiation is ionising radiation. Other ionising radiations include ____ and ____.

Nuclear Radiation

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