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Element X has 3 naturally occurring isotopes with the following masses and percent abundances: X-99 98.9991 34.5% X-102 101.991 22.60% X-104 103.9898 42.90% What is the average atomic mass of element X? 

A substance has a density of 0.644 g/cm3 what is the density of the substance in mg/in3? (1 in =2.54 cm) 

A scientist is looking into a new element she plans on naming basilium  (Bs) the information of the element is show below, how many grams of basilium would there be if there are 9.191 x 1022 atoms?

What does “Z” represent in the following symbol and how do you know? Z is [z] because [reason]. 

What is the formula for platinum (II) phosphide?

Determine what type of bond the following compounds have: MnF3 [1] PO2 [2] SrBr2 [3]

Name the following compounds:  B2S4 [1] C3H8 [2] PSe2 [3]

Determine if the following samples are pure substances or mixtures.    Sample A: Sample A is a [A] Sample B:  Sample B is a [B] Sample C: Sample C is a [C]  

Dark-line (absorption) spectra can be used to identify the ________ present in stars.

Relatively small bodies which generally orbit between Mars and Jupiter are called ________.