Question
Which is the 5th rare gas present in the atmosphere?
- He
- Ar
- Ne
- Xe
Hint:
The atmosphere contains various gases.
The correct answer is: Xe
- Xenon gas is the rarest gas on earth. Air contains only 0.000009% xenon. Therefore, it is only used when no other alternative lighter gas is available.
- In addition to xenon, neon and krypton are present at 0.0018% and 0.00011%, respectively.
- Applications of xenon gas include the manufacture of automotive headlights, semiconductors, plasma display panels, and flash cameras.
- In addition, xenon also has medical applications, including its anesthetic properties.
Related Questions to study
Under standard temperature and pressure (STP) conditions, neon exists as
The correct option is a)monoatomic gas.
- Neon is a monatomic atom because it is an inert gas.
- Noble gases have completely filled outer electron shells. This means that atoms do not have to gain or lose electrons.
- Diatomic elements such as oxygen and nitrogen require electrons to fill their outer shells. When diatomic elements are not bonded to another element, they share electrons with another atom of the same kind. For this reason, oxygen and nitrogen are written as O2 and N2.
- Neon is simply written Ne.
Under standard temperature and pressure (STP) conditions, neon exists as
The correct option is a)monoatomic gas.
- Neon is a monatomic atom because it is an inert gas.
- Noble gases have completely filled outer electron shells. This means that atoms do not have to gain or lose electrons.
- Diatomic elements such as oxygen and nitrogen require electrons to fill their outer shells. When diatomic elements are not bonded to another element, they share electrons with another atom of the same kind. For this reason, oxygen and nitrogen are written as O2 and N2.
- Neon is simply written Ne.
_______ is the first and lightest noble gas.
The correct option is c)He.
- Helium is the lightest of the noble gases and the second most abundant element in the universe. The sun produces hundreds of millions of tons of helium every second.
- Closer to home, over hundreds of millions of years, the radioactive elements decayed deep within the earth to produce helium, and the helium slowly made its way to the surface, where it became trapped in the strata.
- Of the 191,000 particles of air swirling around us, one is helium, but the gas is so light that it escapes Earth's easily gravitational pull and can be lost in space.
_______ is the first and lightest noble gas.
The correct option is c)He.
- Helium is the lightest of the noble gases and the second most abundant element in the universe. The sun produces hundreds of millions of tons of helium every second.
- Closer to home, over hundreds of millions of years, the radioactive elements decayed deep within the earth to produce helium, and the helium slowly made its way to the surface, where it became trapped in the strata.
- Of the 191,000 particles of air swirling around us, one is helium, but the gas is so light that it escapes Earth's easily gravitational pull and can be lost in space.
Among the following, the element possessing a low melting point is
The correct option is b)Non-metals.
Non-metals that form discrete molecules have low melting points. This is because the intermolecular attraction is only about 5-10% of the strength of a covalent bond. Examples include oxygen, nitrogen, fluorine, white phosphorus, sulfur and chlorine.
Non-metals that form network solids have higher melting points because covalent bonds must be broken in order to melt. Examples are boron, carbon and silicon, not to mention germanium.
Among the following, the element possessing a low melting point is
The correct option is b)Non-metals.
Non-metals that form discrete molecules have low melting points. This is because the intermolecular attraction is only about 5-10% of the strength of a covalent bond. Examples include oxygen, nitrogen, fluorine, white phosphorus, sulfur and chlorine.
Non-metals that form network solids have higher melting points because covalent bonds must be broken in order to melt. Examples are boron, carbon and silicon, not to mention germanium.
Which of the following is a property of a non-metal?
The correct option is b)Is brittle and breaks easily
Metal is malleable and can be hammered into a plate. Gold, silver, aluminum and tin can be pounded into very thin sheets called foils. Non-metals do not have malleable properties. Non-metals are not malleable or elastic. It has a dull sheen, whereas iodine has a sheen. Examples of non-metals include carbon, oxygen, sulfur, phosphorus, etc.
Which of the following is a property of a non-metal?
The correct option is b)Is brittle and breaks easily
Metal is malleable and can be hammered into a plate. Gold, silver, aluminum and tin can be pounded into very thin sheets called foils. Non-metals do not have malleable properties. Non-metals are not malleable or elastic. It has a dull sheen, whereas iodine has a sheen. Examples of non-metals include carbon, oxygen, sulfur, phosphorus, etc.
This group of elements has properties that are opposite those of metals. ______________________
The correct option is b)Non - metals.
Non-metals are natural materials which do not generate heat or electricity and are structurally fragile (that is, they cannot be easily rolled, shaped, extruded, or pressed). Hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium are non-metallic elements on the periodic table.
This group of elements has properties that are opposite those of metals. ______________________
The correct option is b)Non - metals.
Non-metals are natural materials which do not generate heat or electricity and are structurally fragile (that is, they cannot be easily rolled, shaped, extruded, or pressed). Hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium are non-metallic elements on the periodic table.
