The electron density of these two bonding electrons is concentrated in the region between the two atoms, which is the defining quality of a sigma bond. Two p-orbitals forming a pi-bond. A double bond between two atoms is formed by the sharing of two pairs of electrons, one in a sigma bond and one in a pi bond, with electron density concentrated on two opposite sides of the internuclear axis.
Looking at the globe as normally seen with the north at the top, the Tropic of Cancer is the upper latitude and the ânâ in caNcer comes before âpâ in caPricorn. ). The Tropic of Cancer was named because at the time of its naming, the sun was positioned in the Cancer constellation during the June solstice. Likewise, the Tropic of Capricorn was named because the sun was in the constellation Capricorn during the December solstice.
Five major circles of latitude. Tropics. Also referred to as the torrid zone or tropical zone, all the water and land of the earth between the Tropic of Cancer and the Tropic of Capricorn.The tropics experience at least one day per year in which the sun passes directly overhead. Tropic of Cancer. A line of latitude located at 23.5Â° north of the equator.The Sun is directly overhead the Tropic of Cancer on the summer solstice in the Northern Hemisphere (June 20 or 21).he tropics experience at least one day per year in which the sun passes directly overhead. Tropic of Cancer. A line of latitude located at 23.5Â° north of the equator. The Sun is directly overhead the Tropic of Cancer on the summer solstice in the Northern Hemisphere (June 20 or 21).