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

The identity of an facet is identified by the number of protons. One cannot change the number of protons without altering the identification of the element. By including a proton, the atomic number increases by one and the element identity changes.

You are watching: The identity of an element is determined by the number of

Number that neutrons have the right to be transformed to produce isotopes. Number of electrons have the right to be changed to create ions.


Explanation:

An element is defined by its number of protons. Varying the number of neutrons will change the isotope of one element and also varying the number of electrons will develop an ion, but an altering the number of protons changes the identification of the element itself. Nitrogen has actually atomic number seven, and also is the only aspect that have the right to have seven protons. The provided configuration is because that an isotope the nitrogen. Because there are eight neutrons, this atom would be because that nitrogen-15.


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Explanation:

Elements are presented on the routine table. Compounds are made once one or an ext element is merged to kind a molecule. The the smallest unit that an facet is one atom, while the smallest unit that a compound is a molecule.

Of the provided answer choices, just satisfies the inquiry criteria. This is the formula for a molecule the bromine gas, do of two bromine atoms.

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is a sodium ion, representing one atom of salt that has actually lost an electron to gain a positive charge. Though it includes only one element, that is not a molecule.
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is a single carbon atom, and also does not represent a molecule.

is the formula because that hydrochloric acid and is the formula for water. Both of these compounds room composed of molecules, yet hydrochloric acids has both hydrogen and also chlorine atoms, and also water contains both hydrogen and also oxygen.


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Example inquiry #4 : Identifying elements


Is it feasible to kind a compound from only one element?


Possible Answers:

Yes; water is a link that is composed of only one element


No; a compound must contain lot of elements


Yes; compounds and also elements space synonyms


Yes; benzene ring contain only carbon


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


Correct answer:

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


Explanation:

Elements are identified by the variety of protons in a offered atom, and the atom is the smallest unit of an element. In contrast, a link is defined by the identity and organization of lot of atoms, with the the smallest unit of a link being a molecule.

Some compounds carry out contain just one element, such together diatomic gases or graphite. Benzene rings are composed the carbon and hydrogen, while water molecule contain hydrogen and oxygen.


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Example question #5 : Identifying aspects


Which of the complying with atomic properties, if known, will expose the identity of the element?


Possible Answers:

More than one of these answers could permit us to identify the given atom


The number of protons


The number of electrons


The atom mass


The variety of neutrons


Correct answer:

The variety of protons


Explanation:

There space two properties that can be provided to recognize an element: the atomic number or the number of protons in one atom.

The number of neutrons and variety of electrons are frequently equal come the variety of protons, yet can vary relying on the atom in question. Various ions and isotopes will transform the variety of neutrons and electrons, making this properties unreliable identifiers. Similarly, atomic mass will certainly vary through the number of neutrons present and cannot be offered to develop atomic identity.


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Example question #6 : Identifying elements


Which the the following phase brand are provided for all diatomic elements?


Possible Answers:

(l)


(g)


(s)


(aq)


(r)


Correct answer:

(g)


Explanation:

Diatomic facets are generally referred come as diatomic gases since whenever they space by themselves, they bond to themselves (that is where the \"2\" subscript comes from). Anytime diatomic elements have that \"2\" subscript, they have actually the gas (g) step label. For example, 

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.


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Example question #7 : Identifying aspects


What is the chemical symbol because that potassium?


Possible Answers:

Na


Po


Pt


K


P


Correct answer:

K


Explanation:

The symbol because that potassium comes from the latin word for potassium, kalium. The is why the chemistry symbol because that potassium is

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.


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Example question #8 : Identifying aspects


Which element likewise goes by its latin name, ferrum?


Possible Answers:

Platinum


Copper


Lead


Gold


Iron


Correct answer:

Iron


Explanation:

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

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 because of its latin name.


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Example concern #9 : Identifying elements


Which element has 42 protons?


Possible Answers:

Molybdenum


Mercury


Technetium


Niobium


Gold


Correct answer:

Molybdenum


Explanation:

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


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Example inquiry #10 : Identifying facets


Which element has 17 electrons?


Possible Answers:

Silicon


Chlorine


Argon


Phosphorus


Sulfur


Correct answer:

Chlorine


Explanation:

Since atoms room neutral, the variety of electrons need to equal the number of protons (to balance the an unfavorable and optimistic charges). For this reason the facet with 17 electrons likewise has 17 protons. The number of protons is equal to the atomic number of the element. Usage the routine table to uncover the facet with atomic number 17, chlorine. Note that ions space not neutral, thus they have unequal numbers of protons and electrons. Also, isotopes of the same aspect contain differing number of neutrons, which additionally affects the weight of the isotope.

See more: The Melting Of Metamorphic Or Igneous Rock Forms What Substance?


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