Periodic Table s p d f Blocks. Periodic table is divided into four blocks, and elements are placed into these blocks based on the sub-shell in which their last electron enters. This classification divides the elements into four types s-, p-, d- and f- block elements.
It was during this visit that Ansel Adams took his first shot with his new Kodak Brownie Box camera. It highly fascinated him. In 1917, he returned alone to the National Park; this time equipped with a better camera and tripod. The visit intensified his interest in photography.
Ansel Adams - Student Encyclopedia (Ages 11 and up) (1902-84). The American photographer Ansel Adams was well known for technical innovations and for his dramatic pictures of Western landscapes. He was a pioneer in the movement to preserve the wilderness and one of the first to promote photography as an art form.