Question
_______ is the first and lightest noble gas.
- Ne
- Ar
- He
- Kr
Hint:
Noble gases are sometimes called inert gases, and they are the elements in group 18 of the periodic table.
The correct answer is: He
- He is the first and lightest noble gas.
- 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.
Related Questions to study
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.
