number of protons in the nucleus of an atom .Every element has a unqiue atomic No

Total No of protons+Neutrons in nucleus

Made out of three types of subtomic particles

Atoms of the same amount of elements that have same amount of protons but different No of neutrons meaning having different mass No

Is the time taken for half the radioactive atoms in a sample to decay after each half life, half of the remaining atoms decay

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Chemistry SCI YR9

Term	Definition
Atomic No	number of protons in the nucleus of an atom .Every element has a unqiue atomic No
Mass No	Total No of protons+Neutrons in nucleus
No of neutrons	Mass No-Atomic No (A-Z)
Atoms	Made out of three types of subtomic particles
Isotopes	Atoms of the same amount of elements that have same amount of protons but different No of neutrons meaning having different mass No
Half Life	Is the time taken for half the radioactive atoms in a sample to decay after each half life, half of the remaining atoms decay