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Explanation:

Sodium sulfate

   Na₂SO₄

 The sulfate ion is SO₄²⁻

Sodium sulfite

    Na₂SO₃

 The sulfite ion is SO₃⁻

Sodium sulfide

   Na₂S

 The sulfide ion is S²⁻

Sodium phosphate

 Na₂PO₄

 Phosphate ion is PO₄²⁻

Sodium phosphite

Na₃PO₃

  The phosphite is PO₃³⁻

Sodium phosphide

 Na₃P

  The phosphide ion is P³⁻

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.