This type of formula indicates the kind, number, arrangement, and bonds but not the unshared pairs of the atoms in a molecule.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space