The outer boundary of cell enclosing nucleus and cytoplasm is called cell membrane or plasma membrane.
<u>More to know</u> -
- It is present in both plant and animal.
- This membrane is living, thin, and delicate.
- The cell membrane is a semi-permeable membrane, that allows the transmission of a very few molecules across it.
Answer :
Compound : It is a mixture of elements which are chemically bonded together in a fixed proportions.
(a) Citric acid, ![C_6H_8O_7](https://tex.z-dn.net/?f=C_6H_8O_7)
In this compound, there are three types of elements present carbon, hydrogen and oxygen. There are 6 atoms of carbon element, 8 atoms of hydrogen element and 7 atoms of oxygen element.
(b) Glycine, ![C_2H_5NO_2](https://tex.z-dn.net/?f=C_2H_5NO_2)
In this compound, there are four types of elements present carbon, hydrogen, nitrogen and oxygen. There are 2 atoms of carbon element, 5 atoms of hydrogen element, 1 atom of nitrogen element and 2 atoms of oxygen element.
(c) Chloroform, ![CHCl_3](https://tex.z-dn.net/?f=CHCl_3)
In this compound, there are three types of elements present carbon, hydrogen and chlorine. There are 1 atom of carbon element, 1 atom of hydrogen element and 3 atoms of chlorine element.
(d) Sulfur hexafluoride, ![SF_6](https://tex.z-dn.net/?f=SF_6)
In this compound, there are two types of elements present sulfur and fluorine. There are 1 atom of sulfur element and 6 atoms of fluorine element.
Answer:
I will give you hints, as follows:
Explanation:
- two words: climate change
- methane smells funny
- the number of electric cars sold each year is increasing
- there´s a reason they´re call "renewable"
- GEOmetry, GEOlogy, GEOthermal
Hope this helps!
The atomic number of an element is based on the number of protons in the atomic nuclei of its atoms.