Resumen Flashcards
1
Q
What does proton number mean?
A
The number of positive charges in the nucleus of an atom of a given element
2
Q
What does nucleon number mean?
A
The sum of the number of neutrons and protons in an atomic nucleus
3
Q
What is an isotope?
A
An isotope is any form of a chemical element that has the same number of protons in the nucleus
4
Q
2 uses of radioactive isotopes:
A
- Nuclear bombs
- Medicine eg as tracers
5
Q
What are valency electrons?
A
An outer shell electron that is associated with an atom
6
Q
Why are the electronic configurations of the noble gases special?
A
They all have the maximum number of valence electrons their outer shell can hold
7
Q
How do you calculate the number of moles?
A
Mass (g)
———————————
Relative formula mass (Mr)
8
Q
How much does one mole in co2 weigh?
A
Carbon (1x12) + Oxygen (2x16)
