A pure chemical compound is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded.
The atom is krypton and its symbol is Kr.
the mass number is 41 + 36 = 77
its charge is 0 as it is a noble gas.
Answer:
Yes, it is correct.
Explanation:
400 cm = 4 m
40 m = 40 m
0.4 km = 400m
Therefore, 400 cm < 40 m < 0.4 km
Plants extract the carbon dioxide from the air and use it in photosynthesis process to feed themselves.