Identify X in the Expression X

Q13: An alpha particle consists of two protons

Q14: The atomic weight for an atom is

Q15: Iodine is the only non-metal that is

Q16: Write the atomic symbols for the following

Q17: Lanthanides are rare earth elements.

Q19: Ions are _.<br>A) atoms that have gained

Q20: Atoms combine to form molecules (compounds) in

Q21: A 3.45 gram sample of hematite (Fe₂O₃)

Q22: The conservation of mass law states that

Q23: Write the atomic symbols for the following