Chemistry, 29.09.2019 04:50 hannahhoskings6989

What are 7 elements from the periodic table that are named after objects in outer space?

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Elements named after celestial bodies are the following. 1.Element 34 (Selenium) is named after the moon. Selene is Greek for moon 2. Element 2 (Helium) is named after the sun. Helios is Greek for sun. 3. Element 52 (Tellurium) is named after the earth. Tellus is the Latin word for earth. 4. Element 80 (Mercury) is named after the planet Mercury. The name Mercury is also a name of a Roman god. 5. Element 92 (Uranium) is named after the planet Uranus. 6. Element 93 (Neptunium) is named after the planet Neptune. 7. Element 94 (Plutonium) is named after the planet Pluto.

Answer from: Quest

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form( $n_2$ ) .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

Answer from: Quest

Determine the wavelength of light emitted when an electron in an li2+ ion makes a transition from an orbital with n = 6 to an orbital with n = 5.

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