Atomic Structure- 2- Class IX

Distribution of Electrons

• Atomic Number

• Mass Number

• Electronic configuration

Element having duplet state

• Neon

• Helium

• Boron

Electronic configuration of Sodium

• 2,8,1

• 2,6

• 2,8,7

Maximum number of electrons in M shell of an atom

• 8

• 6

• 18

Number of protons in atom is called

• Mass number

• Atomic number

• Number of neutrons

Isotopes have

• Similar chemical properties

• Similar physical properties

• Same number of neutrons

Number of isotopes for Hydrogen atom

• 1

• 2

• 3

Isotopes have same

• Number of electrons

• Number of neutrons

• mass number

8 electrons in the outermost orbit of an atom

• Duplet state

• Octet state

• Ionic State

Example of electrovalent compound is

• Water

• Ammonia

• Sodium Chloride