Module 3 Flashcards
1
Q
Law of conservation of mass
A
Matter cannot be created or destroyed, but it can change forms
2
Q
Law of constant composition
A
Samples of a pure compound always have the same elements in the same mass proportion
3
Q
Atomic number
A
The number of protons in an atom
4
Q
Mass number
A
The sum of the protons and neutrons in the nucleus of an atom
5
Q
Isotopes
A
Atoms of an element with the same number of protons but different numbers of neutrons
6
Q
Orbitals
A
A region of space around the nucleus where electrons are most likely to be found
7
Q
Valance electrons
A
Electrons that are in the highest energy level (the energy level farthest from the nucleus) of an atom of an element.
