i) Define atomic mass unit. ii) What is the numerical value of mole. i

1.	i) Define atomic mass unit. ii) What is the numerical value of mole. iii) Name the elements present in oxide ion.
Answer» ong>Answer: i)the mass of an atom of a chemical element expressed in atomic mass UNITS. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes. ii)One mole contains exactly 6.022 140 76 x 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the UNIT mol–1 and is called the Avogadro number. iii)An oxide is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion of oxygen, an O2– (molecular) ion. ... Examples are carbon, iron, nitrogen (see nitrogen oxide), silicon, titanium, and aluminium. Explanation:

i) Define atomic mass unit. ii) What is the numerical value of mole. iii) Name the elements present in oxide ion.

Answer»

ong>Answer:

i)the mass of an atom of a chemical element expressed in atomic mass UNITS. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

ii)One mole contains exactly 6.022 140 76 x 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the UNIT mol–1 and is called the Avogadro number.

iii)An oxide

is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion of oxygen, an O2– (molecular) ion. ... Examples are carbon, iron, nitrogen (see nitrogen oxide), silicon, titanium, and aluminium.

Explanation:

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