The bright light emission spectrums below are seen through a spectroscope. the unknown sample is a mixture of the observed gases. 5 rectangles labeled gas w, gas x, gas y, gas z and unknown sample. gas w has 2 black lines left of center and 2 black lines close together right of center. gas x has two black lines on the far left one on the far right and one on either side of center. gas y has one black line on either side of the center and one black line further right. gas z has one black line on the far left, one in the center and 2 on the right. the unknown sample has one black line on the far left, one in the center, one on either side of center and 2 on the right. which gases are found in the unknown sample? gases w and z gases x and y gases w and y gases z and y