graduation of element

the scientist ------- who discover the nucleus of an atom contain positively charged

• bohr

• medeleeve

• rutherford

• mosely

the scientist -------------------had discovered main 7 energy

• mosely

• bohr

• rutherford

• mendeleeve

the modern periodic table consist of ---------periods ------group

• 18-7

• 7-16

• 7-18

• 7-10

elements of same period in the modern have the same -----

• number of proton

• number of neutrons

• number of electrons

• number of energy level

in periodic table the element which are identical in properties lie in a same

• period

• group

• nucleus

• energy level

the element whose atomic number =18 is

• transitional

• mettallic

• inert gas

• halogens

electronic configuration of Ca 20

g.r both sodium Na 11 and potassium k19 are located in same group

s blocl located -----------------periodic table

• left sid e

• middle

• right

• below

the element x 12 lies in ------------------the periodic table