What monatomic ion has 26 protons, 30 neutrons, and 23 electrons?

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

Connect the whole numbers on the periodic table to indicate what they represent?

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy