Enthalpy virtual lab
Does anybody have all the answers to it ? :(

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

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.

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat