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


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