What is the definition of a Bronsted-Lowry bade

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %