Another method of entering a formula is to use period to separate the elements. Periods are not required after double letter elements. Extra periods are ignored. A space can be used any place that a period can be used. This was added because it may be more convenient to make a space than double tap the sceen to make a period.
Unexpected results are likely to occur.
For example, attempting to lookup HgS as hgs will lookup H, then try to find G, then try to find Gs. Numbers are allowed as they would normally be entered. If used with periods, the number must precede the next period. Numbers can be any non-negative real number. I had great difficulty in imagining why anyone would use imaginary numbers.