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