matematikk.net

As you probably know, elements(grunnstoff) of the periodic table(det periodiske systmet) react with other elements. What do they mean by react?

Dette er vel en upresis formulering. Det burde kanskje stå:
..elements of the periodic table react with eachother... (ettersom det ikke finnes andre 'elements' en de som er i den periodiske tabellen).
React betyr å reagere - altså at grunnstoffene reagerer med hverandre. F.eks. kan hydrogen og okygen reagere og danne bl.a. vann.

As said; Hydrogen and Oxygen can react and make water. When other things react they can also take and give electrons, which make them charged. They then create ions...