Diagrams of several phosphorus-containing substances are shown. The five structures are labelled A, B, C, D and E.
Structure A shows one phosphorus atom linked to three hydrogen atoms.
Structure B shows an ionic lattice consisting of PH$_4^+$ ions and I$^-$ ions.
Structure C shows four phosphorus atoms joined to each other.
Structure D shows Na$^+$ ions and P$^{3-}$ ions arranged in a lattice.
Structure E shows a larger covalent structure made from phosphorus and oxygen atoms bonded together.
(a(i))[1]
Which two of the substances below are ionic?
(a(ii))[2]
Which one of these substances is an element? Give a reason.
(a(iii))[1]
Determine the simplest formula for substance D.
(b(i))[1]
Determine how many neutrons are in one atom of the isotope $^{31}_{15}\text{P}$.
(b(ii))[1]
How many electrons are there in the outer shell of one phosphorus atom?
(b(iii))[1]
Determine the total number of electrons in a phosphorus molecule, P$_4$.
(c)[2]
What kind of oxide is phosphorus(V) oxide? Explain your answer.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “B and D ” …