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Y10 Chemistry TB1 (1.2) Structure of Atoms (Isotopes (Use (estimate the…
Y10 Chemistry TB1 (1.2) Structure of Atoms
Atom
the smallest part of an element
cannot be created destroyed, subdivided, or changed from one type to another
Different atoms have different size, different mass, and different properties
Compound
When atoms chemically joined together
Compounds have different properties from that of its elements
Subatomic Particles
Neutrons
Electrons
Protons
no. of protons = no. of electrons so the atom is neutral
Atomic number and Mass number
Isotopes
Different atoms of the same element which have the same number of protons but different number of neutrons
same chemical properties
same total number of electrons
Use
estimate the age of the carbon-containing objects
estimate by measuring the carbon-14 to carbon-12 ratio
Relative Isotopic Mass
Impossible to measure the exact mass, a reference standard of mass is used
Relative Atomic Mass
the weighted average of the relative isotopic masses of all the natural-occurring isotopes