3. Atoms elements and compounds 3.1

Question	Answer
ATOMS	Smallest particles of matter that cannot be broken down into anything more simple by chemical means
SUBATOMIC PARTICLES	•Protons •Neutrons •Electrons no of electrons = number of protons
PROTONS	Charge : Positive Mass : 1 Location : In the nucleus of the atom
NEUTRONS	Charge : 0 Mass : 1 Location : In the nucleus of the atom
ELECTRONS	Charge : negative Mass : 0 Location: Electron cloud
ATOMIC/PROTON NUMBER	Number of protons in an atom
NUCLEON/MASS NUMBER	Number of PROTONS and NEUTRONS in an atom
ISOTOPE	Atoms of the same element with the same number of neutrons but a different number of PROTONS - therefore have similar physical propertied but different chemical properties
RADIOACTIVE ISOTOPES & Uses	• Emit radioactivity from the nucleus and decay into more stable atoms Uses: medical = used to STERILIZE medical equipment ; used to treat cancer Industrial = used to detect leaks in oil and gas pipelines
NON-RADIOACTIVE ISOTOPES	Isotopes which don't show radioactive decay

Resource summary

	Created by Anna JEFFERIS over 5 years ago