It classify living organisms by2characteristics
Explanation:
Because of non-reactive properties of the inert gases, these gases are useful to prevent the undesirable chemical reactions to happen.
They provide a non-explosive environment. They are also cheap and economical.
Food is packed in the inert gas to prevent rancidity. This also prevents bacteria from growing.
The gases prevents the chemical oxidation by the oxygen in the normal air.
Helium is used in oxygen cylinders and also as a coolant in gas cooled reactors.
Density = Mass/Volume
d = .254/129.4
Answer: Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus. It is the average weight of an element. It is the total number of nucleons in the atom's nucleus.
Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.
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