Which formula below contains the iron (III) ion?
O FeP
O Feo
O FeCl2
o Fe₂O

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

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

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons