High college Chemistry help » Elements and also Compounds » Elements and Atoms » Identifying facets
Explanation:

The identity of an element is identified by the variety of protons. One cannot alter the number of protons without transforming the identity of the element. By adding a proton, the atom number rises by one and also the facet identity changes.

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Number the neutrons can be changed to produce isotopes. Number of electrons deserve to be changed to create ions.


Explanation:

An aspect is characterized by its number of protons. Differing the number of neutrons will adjust the isotope of one element and also varying the number of electrons will create an ion, but transforming the variety of protons transforms the identification of the element itself. Nitrogen has actually atomic number seven, and also is the only element that can have 7 protons. The given configuration is for an isotope that nitrogen. Since there space eight neutrons, this atom would certainly be for nitrogen-15.





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Explanation:

Elements are presented on the regular table. Compounds are made when one or much more element is an unified to form a molecule. The smallest unit that an facet is one atom, while the the smallest unit that a link is a molecule.

Of the given answer choices, only satisfies the concern criteria. This is the formula for a molecule the bromine gas, made of two bromine atoms.

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is a sodium ion, representing one atom of sodium that has lost an electron to acquire a confident charge. Despite it contains only one element, the is not a molecule.
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is a solitary carbon atom, and additionally does not represent a molecule.

is the formula because that hydrochloric acid and is the formula because that water. Both of this compounds are composed the molecules, however hydrochloric acids has both hydrogen and also chlorine atoms, and water contains both hydrogen and oxygen.


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Example concern #1 : Identifying elements


Is it feasible to type a compound from just one element?


Possible Answers:

Yes; compounds and elements room synonyms


No; a compound must contain multiple elements


Yes; benzene ring contain only carbon


Yes; diatomic gases are compounds that consist of only one element


Yes; water is a link that consists of just one element


Correct answer:

Yes; diatomic gases are compounds the consist of only one element


Explanation:

Elements are characterized by the number of protons in a offered atom, and the atom is the smallest unit of an element. In contrast, a compound is characterized by the identity and organization of many atoms, with the smallest unit that a compound being a molecule.

Some compounds execute contain just one element, such together diatomic gases or graphite. Benzene rings are composed of carbon and hydrogen, when water molecules contain hydrogen and also oxygen.


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Example concern #5 : Identifying aspects


Which the the following atomic properties, if known, will expose the identification of the element?


Possible Answers:

More than one of these answers could permit us to determine the offered atom


The number of protons


The atom mass


The number of electrons


The number of neutrons


Correct answer:

The variety of protons


Explanation:

There space two nature that have the right to be provided to determine an element: the atomic number or the variety of protons in an atom.

The number of neutrons and variety of electrons are frequently equal come the variety of protons, but can vary depending on the atom in question. Various ions and also isotopes will change the number of neutrons and also electrons, making this properties unreliable identifiers. Similarly, atomic mass will certainly vary v the number of neutrons present and also cannot be offered to create atomic identity.


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Example concern #6 : Identifying aspects


Which the the following phase brand are supplied for every diatomic elements?


Possible Answers:

(r)


(aq)


(g)


(l)


(s)


Correct answer:

(g)


Explanation:

Diatomic elements are commonly referred come as diatomic gases since whenever they room by themselves, they bond to themselves (that is whereby the "2" subscript comes from). Whenever diatomic elements have the "2" subscript, they have actually the gas (g) phase label. For example, 

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.


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Example inquiry #7 : Identifying aspects


What is the chemical symbol for potassium?


Possible Answers:

P


Pt


Po


Na


K


Correct answer:

K


Explanation:

The symbol for potassium originates from the latin word because that potassium, kalium. The is why the chemical symbol because that potassium is

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.


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Example concern #8 : Identifying elements


Which element also goes by its latin name, ferrum?


Possible Answers:

Iron


Platinum


Lead


Gold


Copper


Correct answer:

Iron


Explanation:

The word for iron in latin is ferrum, thus, the chemical symbol because that iron is

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 because the its latin name.


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Example concern #9 : Identifying facets


Which aspect has 42 protons?


Possible Answers:

Technetium


Mercury


Molybdenum


Gold


Niobium


Correct answer:

Molybdenum


Explanation:

Remember, the variety of protons is equal to the atomic variety of the element. Look in ~ the regular table and find the aspect with atom number 42, it synchronizes to molybdenum.

See more: Which Of The Following Will Have The Slowest Rate Of Diffusion At A Given Temperature?


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Example question #10 : Identifying elements


Which facet has 17 electrons?


Possible Answers:

Argon


Silicon


Sulfur


Phosphorus


Chlorine


Correct answer:

Chlorine


Explanation:

Since atoms space neutral, the variety of electrons need to equal the number of protons (to balance the an adverse and confident charges). Therefore the aspect with 17 electrons additionally has 17 protons. The number of protons is equal to the atomic number of the element. Use the regular table to find the aspect with atomic number 17, chlorine. Keep in mind that ions space not neutral, thus they have actually unequal number of protons and also electrons. Also, isotope of the same facet contain differing numbers of neutrons, which additionally affects the load of the isotope.


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