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.
The area bounded by the Tropic of Cancer on the north and Tropic of Capricorn on the south is known as the tropics.. This area does not experience seasons because the sun is always high in the sky.