Hydrogen (mass number 1) sits next to helium (mass number 2) on the periodic table. Which statement below is not true?

An element is in group 14 and period 5. Answer the following: Name the compound [ans1] Give its symbol   [ans2] Is it metal, non-metal, or semi-metal? [ans3] Would this element be malleable? [ans4]

All particles of matter are in motion. Temperature is a measure of the average motion of the particles in a system. There are three temperature scales (Fahrenheit, Celsius, Kelvin). Which temperature rise indicates the greatest increase in molecular motion?

Elements are made up of atoms. Atoms are made up of protons, neutrons, and electrons. Which component of the atom has the least mass? 

Write the chemical formula for a compound made from aluminum and oxygen. Name the compound. Formula  [red1] Name  [red2] Is it an ionic or molecular compound?  [red3]

There is a difference between counted values and measured values. Which statement is true?

Consider sulfur. How many electrons does an atom of elemental sulfur have?  [blu4] How many valence electrons does it have?  [blu5] If sulfur combined with sodium, how many sodium atoms would end up in the compound? [blu6] Would the resulting compound be ionic or molecular?  [blu7]  

For a given atom or molecule, which form (solid, liquid, gas) of the substance will have the greatest freedom of motion?

Solids, liquids, and gases of a given element differ from each other in the following way.

Balance the following equation. If the coefficient is one, put 1 in the blank.     [fish1]PCl5   + [fish2]H2O –> [fish3]H3PO4 + [fish4]HCl