There are so many gases which we are use in our day to day life. Oxygen, nitrogen, helium, argon are the different example of gases.
What are gases ?A condition of substance known as gas lacks both a set shape and a fixed volume. Compared to other states of matter, such as solids and liquids, gases have a lower density.
Roughly 33% of the nation's total natural gas consumption was accounted for by the industrial sector, and about 34% of the energy used by this sector came from natural gas. Natural gas is used in the home sector to cook, heat water, and dry clothes.
Oxygen gas is used in medical, helium gas is used in balloon, argon gas is used in welding, nitrogen gas is used in , medical equipment.
Thus, oxygen, nitrogen, argon, helium are the gases which are used.
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Analyze: The first shell can hold a maximum of two electrons. How does this explain the valence of hydrogen
Answer:
See explanation
Explanation:
Hydrogen has a valency of +1 or -1. Its electronic configuration is 1s1.
The 1s sub-level (first shell) is known to hold two electrons. This means that hydrogen may either loose this one electron in the 1s level to yield H^+ or accept another electron into this 1s level to form H^- (the hydride ion).
The formation of the hydride ion completes the 1s orbital.
Which of the following are isotopes, choose all that apply.
Element X with atomic number 10 and atomic mass 21
Element Y with atomic number 11 and atomic mass 21
Element Z with atomic number 10 and atomic mass 22
Element M with atomic number 12 and atomic mass 21
Answer:
Element X with atomic number 10 and atomic mass 21
Element Z with atomic number 10 and atomic mass 22
Explanation:
Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
Isotopes of an element have the same electronic configuration. They share the same chemical propertiesThey only differ in their masses.So, Element X and Z with atomic number 10 which is their number of electrons are isotopes. Their mass number, 21 and 22 differs.