Ali chemistry new

Alpha particles are helium nuclei and have charge

• +1

• +2

• +3

• +4

According to Bohr If electron does not remain in an orbit it ------energy

• Emit

• Absorb

• energy remains constant

• emit or absorb

Carbon 14 have -------------protons

• 6

• 7

• 8

• 9

N shell contains maximum ----------electrons

• 8

• 18

• 32

• 2

If an atom have 21 electrons its valence electrons will be in ---------subshell

• s

• p

• d

• none

Mg have atomic number 12 its period---- and group--- will be respectively

• 2,2

• 2,3

• 3,2

• 3,3

S have atomic number 16 its group---- and period--- will be

• 3,2

• 3,4

• 3,6

• 6,3

As we move in period from left to right shielding effect

• increases

• decreases

• remain constand

• can not be calculated

As we move in group from bottom to top atomic radius

• decreases

• increases

• remain constant

• none of these

As we move in period from left to right ionization energy -----

• decreases

• increases

• constant

• none