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Across
What you get when two H atoms join with one O atom
Most common atom in the human body
These particles are positive
Neutrinos often travel at the speed of ____
These have the same types of atoms
The center of the atom
These type of bonds donate electrons between atoms
Covalent ___ share electrons
These small particles make up neutrons and protons
These combine different kinds of atoms
Down
Isotopes of the same element have a different number of these
When two or more atoms join together
The basic building block of all matter
Atom that is in organic molecules
Electrons without any charge
Negatively charged particle
Electrons orbit within these layers, Egg ___
Number of protons in an element is the atomic ____
or 
