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.
As many parents can attest, there's a lot of pressure to send your kids to preschool. In fact, three-quarters of children ages 3 and 4 whose families have incomes of $75,000 and above are enrolled in preschool. Katy, a mother of two in Vancouver, believes kids can do just fine without preschool. I think children can learn all they need to from their parents and the families they socialize with, but that the socializing is important -- being with other kids, making relationships outside the family, she says. That said, her 4-year-old son attended preschool part-time, and her 2-year-old daughter will as well.