The electronic configuration of the carbon atom is written as: 1s²2s²2p². Each s orbital can hold up to 2 electrons, while each p orbital hold up to 6 electrons. That means that the first two shells are closed, while the 4 electrons in the p-orbital is open. The 4 valence electrons of the carbon can bond with many other element, including carbon itself. This unique property is called catenation. That is why one borad field of chemistry, called organic chemistry, is dedicated solely to compounds containing carbon.
Answer:
<u>retrograde motion </u>
Explanation:
All the planets have direct motion or progade motion i.e. they move in eastward direction around the Sun. The exceptions are Venus and Uranus which apparently move westwards. This is type of motion is known as retrograde motion. Venus and Uranus move opposite to the other planets motion against the background of stars.
A.<span>In this stage, the chromosomes begin to spread out across the center of the cell.</span>
