Question

1.) A monatomic ion with a charge of -2 has an electronic configuration of 1s22s22p63s23p64s23d104p6

2.) A monatomic ion with a charge of +1 has an electronic configuration of 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶.

Answer 1

Monoatomic ion which has -2 charge is formed from oxygen family element.

When there is -2 charge on an atom that means two extra electrons are added to the electronic configuration of base atom. Lets count electrons and then predict the ion .

1s22s22p63s23p64s23d104p6

Total number of electrons = 36

Atomic number = 36 – 2 = 34

34 is the atomic number of Se

So the ion is Se^2-

2).

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶.

Number If there is positive charge on atom that mean it lost its one elctron so atomic number of the base atom is more than the given number of electrons

Atomic number of given atom = 36+1 = 37

This is atomic number of Rb

So the ion is Rb⁺¹