How many valence electrons does Z have?

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Gymnast always perform on padded mats. how does the mats protect the gymnast

Explain what happens at the saturation point when adding salt to water at room temperature.