Answer:
<em>Knowing how elements and compounds react together is essential in everyday life is essential to people like a scientist and someday you might become a scientist no matter what you become you will have to learn all that you can.</em>
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ATP<span>, or adenosine triphosphate, is the most important high-energy compound. It is a nucleoside triphosphate, and its formula is C10H16N5O13P3.</span>
Answer: <span>O₂(g), Br₂(l) Fe(s), He(g)
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Justification:
1) The state variable given, ΔHf°, is <span>the standard
enthalpy of formation. By definition it is the change in the enthalpy that accompanies the
formation of a mole of compound in the standard state, from its
constituent elements in the standard state.
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2) Since the standard state of <span>O₂(g), Br₂(l) Fe(s), He(g) is the very same shown, they do not evolve any heat for its formation. This is, that is the same state of the constituents, and no change is involved.
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<span>That is why, </span><span>ΔHf°, of those elements is 0.
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Answer:
He (helium, that is) has 2 protons in its nucleus.
Explanation:
The placement of numbers around an element's symbol can be confusing. Generally, an element symbol written in this format has the atimic mass in the upper left and the element number on the lower left. The upper right is the lement's charge, zero in the is case because there are two electrons and two protons, for a net charge of zero.
Some symbols will include additional information, such as electron configuration. Be aware of a publication's standard for the notation style used.
