Which picture BEST represent a mixture?   a.        b.     c. 

What’s the total mass of 10 Indium atoms?

Some radioactive elements have short-lived isotope(s). Their average atomic masses are not determined, and the mass numbers of their most stable isotopes are listed on the periodic table instead.  Find Es in the periodic table and give the number of neutrons in its most stable isotopic atom.  

Which picture BEST represents a solid?

A sample of gold weighs 0.007605 grams.  What’s the number of significant figures of this weight?

Which picture BEST represents a compound? a.        b.     c.   

Some radioactive elements have short-lived isotope(s). Their average atomic masses are not determined, and the mass numbers of their most stable isotopes are listed on the periodic table instead.  Find Am in the periodic table and give the number of neutrons in its most stable isotopic atom.  

What’s the total mass of 100 thallium atoms?

What is the electronic configuration for Ni? a)1s22s22p63s23p64p84s2 b)1s22s22p63s23p63p104s2 c) 1s22s22p63s23p64s23d8 d)) 1s22s22p63s23p64s24p8 e)) 1s22s22p63s23p64s43p5

How many significant figures does 0.000458 have?