The following isotopes of theoretical element X are listed below with their abundance and atomic mass. Determine the average atomic mass of element X.  Isotopes of X Isotope Abundance Atomic Mass (amu)  X-13 84.00% 12.99921 X-14 9.000% 13.9875 X-15 7.000% 14.9921  

How many protons and electrons are in an atom of arsenic (As)?  Protons = [p] Electrons = [e]

Answer the following statements regarding the periodic table shown below. The section labeled A is the group named [1]. The section labeled B is the group named [2]. 

Which of the following molecules have ionic bonding?  1) Na2O      2) C2H4      3) CaCl2     4) O2       5) NH3

Which of the following molecules have ionic bonding?  1)  C2H6    2) Li2O      3)    NH3   4) CaF2     5) H2   

The sample below is made up of different types of particles. Two of those particles are zoomed in on labeled Particle A and Particle B. Determine what type of particle they are.  Particle A is [A]. Particle B is [B]. 

Determine the amount of protons, neutrons, and electrons in element A. Protons =[1]  Neutrons= [2] Electrons = [3]

Name the following compounds. SO2 [1] C3H8  [2] N2Cl3 [3]

Determine if the following statements are true of false.  There are more molecules in 1 mole of oxygen gas than 1 mole of nitrogen gas [1] There are more oxygen atoms in 1 mole of carbon dioxide than in 1 mole of carbon monoxide [2]  12 g of water (H2O) has the same number of molecules as 12 g of hydrogen dioxide (H2O2) [3]

What is the answer to the correct amount of significant figure of the following problem?