Unit 1 - Atomic Structure Flashcards
1
Q
Period
A
a row of elements
2
Q
Group
A
a Column of elements
3
Q
Nobel gases
A
the most unreactive group
4
Q
Halogens
A
the most reactive non-metals
5
Q
Alkali metals
A
the most reactive metals
6
Q
Atomic Number
A
Number of protons
7
Q
Mass number
A
Number of Protons + Number of Neutrons
8
Q
Isotopes
A
atoms of the same element with different mass number. The same number of protons but different number of neutrons
