High college Chemistry assist » Elements and Compounds » Elements and also Atoms » Identifying aspects
Explanation:

The identity of an aspect is established by the variety of protons. One cannot change the variety of protons without transforming the identification of the element. By adding a proton, the atomic number increases by one and also the element identity changes.

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Number of neutrons deserve to be changed to develop isotopes. Variety of electrons can be transformed to develop ions.


Explanation:

An element is defined by its variety of protons. Differing the variety of neutrons will readjust the isotope of one element and also varying the variety of electrons will develop an ion, but changing the variety of protons alters the identity of the facet itself. Nitrogen has actually atomic number seven, and is the only aspect that can have seven protons. The given configuration is for an isotope of nitrogen. Because there room eight neutrons, this atom would certainly be for nitrogen-15.





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Explanation:

Elements are displayed on the periodic table. Compounds space made when one or more element is linked to form a molecule. The smallest unit of an aspect is one atom, when the smallest unit the a link is a molecule.

Of the provided answer choices, only 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 sodium that has actually lost one electron to get a hopeful charge. Though it contains only one element, the is no 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 this compounds room composed that molecules, yet hydrochloric acids consists of both hydrogen and chlorine atoms, and water has both hydrogen and also oxygen.


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Example question #1 : Identifying facets


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


Possible Answers:

Yes; compounds and also elements room synonyms


No; a compound should contain many elements


Yes; benzene rings contain only carbon


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


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


Correct answer:

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


Explanation:

Elements are defined by the number of protons in a given atom, and the atom is the the smallest unit of an element. In contrast, a compound is defined by the identity and also organization of many atoms, through the the smallest unit the a compound being a molecule.

Some compounds do contain only one element, such together diatomic gases or graphite. Benzene rings are composed that carbon and hydrogen, if water molecules contain hydrogen and also oxygen.


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Example question #5 : Identifying facets


Which that the adhering to atomic properties, if known, will reveal the identification of the element?


Possible Answers:

More than one of these answer could permit us to recognize the provided atom


The number of protons


The atomic mass


The variety of electrons


The number of neutrons


Correct answer:

The variety of protons


Explanation:

There room two nature that have the right to be offered to recognize an element: the atomic number or the variety of protons in one atom.

The variety of neutrons and variety of electrons are generally equal to the number of protons, yet can vary relying on the atom in question. Different ions and isotopes will change the number of neutrons and electrons, making these properties unreliable identifiers. Similarly, atom mass will vary v the variety of neutrons present and also cannot be offered to develop atomic identity.


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Example concern #6 : Identifying aspects


Which the the complying with phase brand are supplied for all diatomic elements?


Possible Answers:

(r)


(aq)


(g)


(l)


(s)


Correct answer:

(g)


Explanation:

Diatomic aspects are commonly referred to as diatomic gases because whenever they room by themselves, they shortcut to us (that is where the "2" subscript come from). At any time diatomic elements have the "2" subscript, they have the gas (g) step label. Because that example, 

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.


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Example inquiry #7 : Identifying facets


What is the chemical symbol for potassium?


Possible Answers:

P


Pt


Po


Na


K


Correct answer:

K


Explanation:

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

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Example concern #8 : Identifying elements


Which element additionally goes through its latin name, ferrum?


Possible Answers:

Iron


Platinum


Lead


Gold


Copper


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:

Technetium


Mercury


Molybdenum


Gold


Niobium


Correct answer:

Molybdenum


Explanation:

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

See more: How To Find The Area Of A Regular Decagon : Sides, Area, & Angles


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Example concern #10 : Identifying elements


Which element has 17 electrons?


Possible Answers:

Argon


Silicon


Sulfur


Phosphorus


Chlorine


Correct answer:

Chlorine


Explanation:

Since atoms space neutral, the number of electrons should equal the number of protons (to balance the an adverse and hopeful charges). Therefore the facet with 17 electrons also 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 atom number 17, chlorine. Note that ions are not neutral, for this reason they have actually unequal numbers of protons and also electrons. Also, isotopes of the same aspect contain differing numbers of neutrons, which likewise affects the weight of the isotope.


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