Unit 1 -Foundation Chemistry Flashcards
1
Q
Atomic Number, Z
A
The Number of Protons in the nucleus is called the atomic number or the Proton number, Z.
2
Q
Number of Electrons?
A
Nº of Electrons = Nº of protons (electrically neutral)
3
Q
Nº of Protons
A
Atomic number (proton nº) Z = nº of protons
4
Q
Mass number, A
A
The total number of nucleons (protons + neutrons), nucleons are responsible for the mass of an atom.
5
Q
What is an Isotope?
A
Atoms with the same number of protons but a different number of neutrons are called isotopes.
6
Q
How do isotopes of the same elements react?
A
Different Isotopes of the same element react chemically in exactly the same way.
7
Q
Why do Isotopes Vary in Mass number?
A
Different Isotopes of the same element vary in mass number because of the different number of neutrons in their nuclei
