c4- chemical calculations Flashcards
1
Q
what is the number at the top of an element
A
mass number=protons and neutrons
2
Q
what is the number at the bottom of an element called
A
atomic number=protons/electrons
3
Q
what is the Ar(relative atomic mass) of an element
A
average mass of all the isotopes of that particular element
4
Q
what is the relative formula mass (Mr)
A
