An isotope is an atom that has the same number of protons but a different number of electrons.

Organs of the body are defined as ____.

A + B → AB is to synthesis as AB → A + B is to ______.

When the positively charged hydrogen end of one molecule is attracted to the negatively charged end of another polar molecule, a(n) _____ bond is formed.

The valence electron shell of a reactive atom is full. 

When the positively charged hydrogen end of one molecule is attracted to the negatively charged end of another polar molecule, a(n) _____ bond is formed.

The innermost electron shell in an atom holds up to ___ electrons.

Blood clotting is an example of ________.

4.  Necesitan practicar los lunes en el laboratorio.

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