Phosphorus is a chemical element with symbol P and atomic number 15. As an element, phosphorus exists in two major formsâ white phosphorus and red phosphorus âbut due to its high reactivity, phosphorus is never found as a free element on Earth. Instead phosphorus-containing minerals are almost always present in their maximally oxidised state, as inorganic phosphate rocks.
Ages & Stages â Preschool Children. Three and four-year-old children are often called preschoolers. Preschool children want to touch, taste, smell, hear, and test things for themselves. They are eager to learn. They learn by experiencing and by doing. Preschoolers learn from their play.
Preschools generally fall into two categories, preschool playgroups and nursery schools. Preschool playgroups accept children aged between two and five and are short sessions where children stay and play with other children their age.Nursery classes and schools (not to be confused with day nurseries) take children aged 3 and 4 years old, usually for the year before they start the first school year.reschool playgroups accept children aged between two and five and are short sessions where children stay and play with other children their age. Nursery classes and schools (not to be confused with day nurseries) take children aged 3 and 4 years old, usually for the year before they start the first school year.