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Structure of Atom

Junior cycle science ch 24

materials around us are made of atoms
an atom is the smallest particle of an element ...... that still has the properties of that element
John Dalton imagined atoms as ... very small marbles
to see atoms use an electron microscope
subatomic particles are found inside in an atom
protons have a positive charge
electrons have a negative charge
neutrons have no charge
protons and neutrons both have a relative mass of 1
protons and neutrons are found in the nucleus
electrons are found outside the nucleus on an electron cloud or shell
the mass of an electron is much smaller or bigger than a proton smaller
Neils Bohr is the scientist who first said that electrons move in fixed paths called shells or orbits
all atoms are neutral therefore they have the same number of protons and electrons
the atomic number of an atom is equal to the number of protons or electrons in the atom
mass number is the number of protons plus the number of neutrons
to calculate the number of neutrons in an atom... subtract the atomic number from the mass number
the only element with atoms with no neutrons is Hydrogen
The nuclear formula for an atom shows both mass number and atomic number
Atoms of an element are all the same
The periodic table is an arrangement of elements in order of... increasing atomic number
scientist who first drew the periodic table was Dmitri Mendeleev
vertical columns in the periodic table are called.... groups or families
horizontal rows of elements are called periods
Group 8 elements are called ...... Noble or inert gases
Created by: PDervin



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