C1.1 - The Fundamental Ideas In Chemistry Flashcards
1
Q
What is an isotope?
A
An atom of the same element with a different number of neutrons in the nucleus.
2
Q
The mass number is…
A
The total number of protons and neutrons in the nucleus.
3
Q
The atomic number is…
A
The number of protons in the nucleus.
4
Q
To find the mass number of a compound, you…
A
Add together the mass numbers of the elements that it contains.
5
Q
Which energy shells will electrons occupy?
A
The lowest possible energy shells.
6
Q
Which group of elements is the most stable and why?
A
Noble gases, because they have a full outer shell of electrons.
7
Q
What does the nucleus contain?
A
Protons and neutrons.
