Module 3: Chemistry-Atomic Structure & the Periodic Table Flashcards
1
Q
Law of Conservation of Mass
A
Matter cannot be created or destroyed bit it can change forms.
2
Q
Law of Canstant 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 the protons in an atom.
4
Q
Mass Number
A
The sum of the protons and neutrons of an atom.
5
Q
Isotopes
A
Atoms of an element with the same number of protons but different number of neutrons.
6
Q
Orbitals
A
A region of space around the nucleus where the electrons are most likely to be found.
7
Q
Valence Electrons
A
Electrons that are in the highest energy level (the energy level farthest from the nucleus) of an atom of an element.
