Elements are composed of extremely small particles called? (#1 in Dalton's Atomic Theory)
#2 in Dalton's Atomic Theory
All atoms of a given elemen are identical, having the same size mass and chemical properties. The atoms of one element are different from the atoms of all other elements.
______ are composed of atoms of more than one element. In any compound, the ratio of the numbers of atoms of any two of the elements present is either an integer or a simple fraction. (#3 in Dalton's Atomic Theory)
A ______ involves only the seperation, combination, or rearrangement of atoms; it does not result in their creation or destruction. (#4 in Dalton's Atomic Theory)
Atoms positive charge is concentrated in
mass of p is ___ X the mass of e
number of protons in nucleus.
number of protons + number of neutrons OR atomic number + number of neutrons
are atoms of the same element with different numbers of neutrons in their nuclei.
The isotopes of hydrogen
same number protons, different numbers of neutrons theefore mass is different.
Natural abundance of elements in earths crust
oxygen 45.5%, silicon 27.2%, all others 5.3%, Magnesium 2.8%, Calcium 4.7%, Iron 6.2%, Aluminum 8.3%