An atom has 29 protons and 34 neutrons.  Which of the following is the correct way to express this isotope?

This transition metal is one of the only elements to exist as a liquid at room temperature, this is a dangerous environmental toxin that accumulates in fish.

This element loses 2 electrons to form an ion; not consuming enough of it can increase risk of osteoporosis.

On earth, it takes four of the smaller stones to balance the large rock in the structure shown below. About how many of the small stones would it take to balance the large rock if the apparatus was moved to the moon, where gravity is 1/6th that of of earth and why?   

Which of the following  is the definition of electron configuration?

Which of the following is most likely a poor conductor of heat and electricity? 

Which of the following refers to a particle with a net charge, which could be positive or negative?

What is the charge of an ion of gold (Au) if it has 75 electrons?

In the following generic atomic symbol, what does the number 14 represent?

There are two stable isotopes of boron (B, element 5).  These are Boron-10 and Boron-11.  One of these isotopes makes up 80% of all the boron particles and the other, about 20%.  Which is the more common one and how do we know?