4.3 Flashcards
1
Q
Atomic Number
A
Number of protons an atom contains
2
Q
Mass Number
A
Total number of protons and neutrons
3
Q
How is the number of neutrons found
A
Mass number-atomic number
4
Q
Isotopes
A
Atoms of the same elements with same number of protons and electrons but different number of neutrons (chemically alike)
5
Q
Atomic Mass
A
Weighted average of the mass of the isotopes
6
Q
What is AMU based on
A
The mass of a carbon-12 atom
7
Q
Atomic mass is usually close to what
A
Mass of its most abundant isotope
8
Q
Elements are different because their atoms contain different numbers of
A
Protons
9
Q
Hydrogen
A
Hydrogen-1
10
Q
Deuterium
A
Hydrogen-2
11
Q
Hydrogen-3
A
Tritium
12
Q
The particles that make up atoms-protons, neutrons, and electrons- are known as
A
Subatomic particles
13
Q
Most of the atoms volume is occupied by
A
Electrons
