An atom represented by X forms an ionic compound with the nitride anion, with the formula XN. The atom is most likely —

Al

Mg

Si

Cs

Ibelieve the answer is d. bleachhope my answer has you : )

The disturbance is only parallel to the motion of the wave.

The reaction 2kalsi3o8 + 2(h+ + hco3-) + h2o  →  al2si2o5(oh)4 + 2k+ + 2hco3- + 4sio2 shows that feldspar kalsi3o8 is chemically altered by hydrolysis to form chalky-looking clay mineral kaolinite al2si2o5(oh)4. the chemical breakdown of potassium feldspar due to exposure to acidic water results to the mineral binding with the water molecule to become kaolinite with silica and potassium and bicarbonate ions in solution.

The answer is  d.  hydrogen