molecules and ions

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molecules and ions

atom

structure

No. P+ No.N = mass no

weight average mass of an element

No.P = No. E

P+E = nucleus

nuetron (N)

charge 0

electron (E)

charge -1

surround nucleus

proton (P)

charge +1

smallest particle in element

isotope

different no of electron

atom

different mass no

same atomic no

matter

pure substance

smallest particle found

molecule

form from covalent bonding

sharing of electron

cannot be separated bt phy method

cannot be decomposed by chem process

compound

constant composition

element combine chemically

differ from constituent element

can be from by ionic bonding

transfer of electron

can be decomposed by chem process

element

mixture

can be separated by phy method

uniform

homogenous

not uniform

heterogenous