PUZZLE HOME * Cell Biology Crossword # 2 * Genetics Quiz * HIV & AIDS Quiz * atoms Quiz * climate change Quiz *

the electrical charge of a proton is:
the electrical charge of a neutron is:
the electrical charge of an electron is:
an atom is electrically:
the atomic number (Z) which defines an element is:
different isotopes of the same element have:

ATOMS are very, very small. They are the basic units of elements. Examples of elements are iron (symbol Fe), oxygen (symbol O), hydrogen (symbol H) and carbon (symbol C). Atoms are made of protons, neutrons* and electrons. Molecules are formed when two or more atoms are joined together. Common examples of molecules are water (H2O) and carbon dioxide (CO2).

* one isotope of one particular element has no neutrons. Do you know which one?

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