The tetragonal crystal system below possesses how many faces?
2 faces
4 faces
6 faces
8 faces

The tetragonal crystal system below possesses two faces. The two axes are of equal length and are in the same plane, the main axis is either longer or shorter and all three intersect at right angles. The Crystal shapes include four-sided prisms and pyramids, hexacisochedron. 

your answers are a,b,,e and f

i hope this

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer