|
All atoms of an element have the same number of ____.
|
bonds
|
|
Na and Cl are the ____ for sodium and chlorine.
|
elements
|
|
At STP, equal volumes of gases have an equal number of ____.
|
isotopes
|
|
C-12 and C-14 are ____ of carbon atoms. Each has six protons.
|
mixtures
|
|
A spoonful of table salt (NaCl) is composed of two ____.
|
molecules
|
|
The isotopes of an element have different numbers of ____.
|
neutrons
|
|
Atoms can be joined together by ____ to form molecules.
|
protons
|
|
Heterogeneous ____ can be separated by physical means.
|
symbols
|
