Question

which atom is most electronegative

- P

-Cs

-Cl

-Li

Which of the following anions same charge hydroxide ion?

SO4 2-

PO4 3-

CO3 2-

NO3-

Which contains 6 valence electrons

Cl

Si

S

P

Which of the following is the sulfate ion

PO4 3-

CO3 2-

S2-

SO4 2-

Which one is most likely to be ionic

GaAs

SrBr2

CBr4

NO2

Answer 1

1. Electronegativity : Tendency to attract electrons towards itself.

From periodic Table, As we move from left to right, electronegativity of element increases as size decreases. Thus, Most electronegative element is Cl

2. Hydroxide ion is : OH^-. Thus, having -1 charge

Thus, answer is: NO₃^-

3. Valence shell electronic configuration of

Cl = 3s²3p⁵ = 7 electrons

Si = 3s²3p² = 4 electrons

S = 3s²3p⁴ = 6 electrons

P = 3s²3p³ = 5 electrons

Answer is S

4. Sulfate ion is SO₄^2-

5. Elements having electronegativity difference more than 1.7 are ionic. Most of them are compounds consisting of metals and non- metals.

GaAs :Covalent

SrBr₂ : Ionic ( metals and non-metals)

CBr₄ : Covalent

NO₂ : Covalent