chapter 8 - model of matter(atoms & molecules)
ATOMS
smallest unit of an ELEMENT
ATOMS OF AN ELEMENT are all identical (eg. on e sliver atom would be identical to any other sliver atom)
ATOMS OF TWO DIFFERENT ELEMENTS would be different types of atoms
STRUCTURE OF AN ATOM(ALL PROTONS , ELECTRONS AND NEUTRONS AND SUB-ATOMIC PARTICLES)
Proton( has a positive charge)
location : nucleus
Relative mass : 1
relative charge : +1
neutron(no charge)
location:nucleus
relative mass:1
relative charge:0
Electron(negatively charged)
location: electron shell
Relative mss: 1 or 1/1840(negilgible mass)
relative charge: -1
the number of protons is equal to the number of electrons
positive and negative charges in the atom are balanced so the atom is said to be ELECTRICALLY NEUTRAL
nucleon number(atomic = proton + neutron (always the bigger number i thk ;-;) besides hydrogen
an atom can combine with one or more atoms of the same or different elements to form molecules
a molecule is made up of two or more atoms that are CHEMICALLY COMBINED
advantages & disadvantages of technologies
advantages: Energies from atoms is used in nuclear power plants
compounds consists of more than on element *
disadvantage : accidents at nuclear power plants can result in the loss of lives and environmental pollution while atomic bombs can bring about destructive effects
consists of empty space , electrons and the nucleus(which contains neutrons and protons)
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Subatomic particles are the particles found inside an atom and are responsible for forming the structure of an atom
electrically neutural:they have equal numbers of protons (positively charged) and electrons (negatively charged)