Question

(5 marks Answer)
The atomic mass of an element is in fraction . What does this mean ??

(3 marks Answer)
Find out the mass of
$\sf Co_2Co$
2
​

in reaction
$\sf {CaCo_3}^{heat} \longrightarrow$ CaO + Co_2CaCo
3
​

heat
⟶CaO+Co
2
​

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- Brief explanation ​

Answer 1

Explanation:

the atomic masses of most elements ate fractional because they exist as a mixture of isotopes of different masses

Answer 2

Answer:

here is your answer

Explanation:

1.answer:

First of all, don’t confuse mass numbers (always whole numbers) with atomic masses which all have a decimal component (except perhaps, for C-12).

The mass number is simply a count of the nucleons (protons and neutrons), and since it is a “counting number” it is a whole number. Atomic mass has no such constraint, and it based on the actual masses of the individual atoms (isotopes).

The atomic mass seen on the periodic table is the weighted average of all of the naturally occurring isotopes of a particular element. It’s likely that there are actually no isotopes with the mass printed there since it is an average. The exception to that is when there is only one naturally occurring isotope of an element (Na, for example).

If you look toward the heaviest elements with high atomic numbers you will see whole numbers as the atomic weight. Those numbers are the mass numbers of the most common isotopes, not actual atomic masses.

hope it is helpful for you.