Chemistry, 10.10.2019 07:30 nosugh

Which statement accurately compares the trends in atomic number and atomic mass in the periodic table?

a. the atomic number increases from left to right, while the atomic mass increases from right to left.
b. the atomic mass increases from left to right, while the atomic number increases from right to left.
c. both the atomic mass and the atomic number increase from left to right.
d. both the atomic mass and the atomic number increase from right to left.

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Answer from: sajasolo3467

C.Both the atomic mass and the atomic number increase from left to right.

Answer from: Quest

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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.

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