Answer: C): the number of unpaired electrons.
Explanation: A covalent bond is a type of chemical bond formed by sharing equal number of electrons between two non-metal atoms so that both can attain the a stable octet or duplet structure of noble gases. The electrons shared by two non-metal atoms are the unpaired electrons. For example, in the formation of a chlorine molecule, a chlorine atom has seven valence electrons and electrons usually occur in pairs. Having seven valence electrons means that a chlorine atom has three pairs of electron and one unpaired electron in its outermost shell. The two chlorine atoms will combine together each donating its unpaired electron to be shared, thus leading the two atoms to attain stable octet structure of Argon.
Answer:
(c)- Capture light energy
Explanation:
The process of Photosynthesis is to prepare chemical energy by the use of light energy from the sun .
The pigment responsible for photosynthesis is Chlorophyll , which is present is the leaves of the plant or tree , which capture the light energy of the sun , and then with the help of the energy and carbon dioxide and water absorbed by the roots , the food of plant is prepared , i.e. , oxygen along with energy .
hence , the correct answer for the given statement is ( c ) .
A minimum stream velocity <span>needed to keep a 6.4 cm diameter particle in motion must be 100 cm/s.
It can be concluded from Hjulstrome curve, a graph used to determine whether stream will transport, erode or deposit particles. The faster is the current, the heavier particles it could transport.</span>