Atomic Structure Flashcards
1
Q
In an elements box on a periodic table there are two numbers, what do these represent?
A
mass number (A) Atomic number (Z)
2
Q
The smaller number is the…
A
Atomic number
3
Q
The bigger number is the…
A
Mass number
4
Q
The atomic number is the number of…
A
PROTONS
5
Q
The mass number is the number of..
A
PROTONS + ELECTRONS
6
Q
What is molecular formula?
A
The number of atoms of each element in a formula
7
Q
What does relative molecular mass mean? (Mr)
A
The average mass of a MOLECULE of that element or compound relative to 1/12 of the MASS of carbon-12
8
Q
What does relative atomic mass mean? (Ar)
A
It is the average mass of one ATOM relative to 1/12 the mass of one ATOM of carbon-12
