What comes after observations when scientific knowledge is gathered

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

What is the value of keq for the reaction expressed in scientific notation

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