He saw that the similar elements occurred at regular atomic weight intervals.

Each element of a hierarchy occurs at a particular level.

And because you did that, the final element of the miracle occurred.

Consequently, these elements occur together in natural minerals and are difficult to separate.

The results are pairs of photographs in which the so-called common elements occur.

The following elements do not occur naturally on Earth.

Some elements can occur as more than a single chemical substance (allotropes).

In the set construction, each element can occur zero or one times.

Thus, many elements of the building occur in groups of nine.

Each single element occurs 253 times somewhere in some octad.