and atomic mass for each element. Students will focus on the first 20 elements. They will try to correctly match cards with information about an element to each of the first 20 elements. Students will ...

Scientific research has discovered some elements that stand out due to their exceptional density and atomic weight. They make up the heaviest metals on earth and are used in various fields.

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was less than the atomic mass (average mass of the atom). For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2. Since electrons have almost no mass ...