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6 protons......atomic number = 6 - element = OXYGEN Most atoms also contain a number of neutrons in the nucleus and can therefore also be classified by the sum of protons and neutrons, which is known as the ATOMIC MASS (protons and neutrons both have an atomic mass of "1", whereas electrons are so small they can be ignored).Since the number of neutrons in an atom can vary, some atoms of the same element can have different mass numbers. 6 protons 6 neutrons...atomic mass = 12 - OXYGEN 18 ENERGY LEVELS: Atoms have no more than 2 electrons in their innermost shell.
The protons and neutrons are found in the NUCLEUS and the electrons orbit the nucleus in ELECTRON SHELLS or ENERGY LEVELS.VAN DER WAALS BONDS: Result from weak electrical attractions caused by minor charge imbalances between certain ions. When this sediment becomes LITHIFIED, a layer of solid SEDIMENTARY ROCK is formed. There are two approaches to the DATING OF ROCKS: 1.They are much weaker than the strong ionic and covalent bonds. About 75% of all rocks exposed on the surface of the continents are sedimentary rocks. Which of the following sequences contains an igneous, sedimentary and igneous rock, in that . Before the advent of modern technology, the approach of RELATIVE DATING was taken.Atoms are at their most stable when they have exactly 8 electrons in their outermost shell; atoms will therefore tend to lose or gain electrons in order to achieve exactly eight electrons in their outermost shell (octet rule).IONIC BONDING: the "lending and borrowing" of electrons to achieve 8 electrons in the outermost shell; these atoms now become electrically charged or IONS.