A compound differs from an element in that it can be decomposed by a chemical reaction.
A compound, by definition, is made up of two or more elements that have been combined together through a chemical bond.
Thus, the chemical bond or bonds in a compound can be decomposed by a chemical reaction giving rise to the individual elements that make up the compound.
This is unlike an element that can not be decomposed by any chemical reaction.
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The atoms that the electrons leave behind become positive ions, and the interaction between such ions and valence electrons gives rise to the cohesive or binding force that holds the metallic crystal together
The average rate of a reaction is a good approximation of an instantaneous rate when the concentration is measured during relatively brief time intervals.
At any point during such a little period, the average rate will be extremely near to the instantaneous rate. The average rate will differ from the instantaneous rates inside the period more when time intervals are longer.
The concentration change during a chosen time period is the average rate. When you take the measurements makes a difference.
The rate at a specific moment is known as the instantaneous rate. Finding the slope of the tangent to the concentration vs. time curve at that point yields the answer.
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Answer:
18 atoms has a mass of 18.0g (grams)
<span>The elements for which the neutral atom has a valence electron configuration of .
are those whose valence electron shell has 2 + 6 = 8 electrons.
Those are the noble gases, except helium (He).
Here is the list of the noble gases and the configuration of their valence electron configuration:
He:
Ne
Ar
Kr
Xe
Rn
Answer: Ne, Ar, Kr, Xe and Rn</span>
