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periodic table
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the number of protons + neutrons in the atom
mass number
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..................discovered that the nucleus of the atom contains positively charged protons.
Rutherford
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....................elements are classified in the modern periodic table , ........ elements are found naturally
116-92
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Moseley arranged elements in an ascending order according to their
atomic number
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Na element with 11 atomic number.in which period and group is it?
group 1 period 3
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mendeleev's periodic table contains alot of isotopes
true
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mendeleev arranged elements in an ascending order according to their .....................
atomic weight
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f-block is located on the left of the table
false -below
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Mendeleev classified .................... elements on 1871
67
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.....................revolve around the nucleus in fixed orbits called.........................
electrons-energy levels
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is the number of protons in the nucleus
atomic number
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