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.
Mixed-age groupings: In a mixed-age preschool class of 2.5-5 year-olds, no more than four children between the ages of 30 months and 36 months may be enrolled and the ratios within group size for the predominant age group apply. If infants or toddlers are in a mixed-age group, the ratio for the youngest child applies. For a group of 10 children, in a Toddler/Two group with ages 12 months to 28 months, there must be 3 teaching staff to meet.