High institution Chemistry aid » Elements and also Compounds » Elements and also Atoms » Identifying facets
Explanation:

The identification of an facet is identified by the variety of protons. One cannot transform the variety of protons without transforming the identification of the element. By including a proton, the atom number increases by one and also the element identity changes.

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Number of neutrons deserve to be changed to produce isotopes. Variety of electrons have the right to be changed to develop ions.


Explanation:

An aspect is characterized by its variety of protons. Varying the number of neutrons will adjust the isotope of an element and varying the number of electrons will produce an ion, but changing the number of protons changes the identity of the facet itself. Nitrogen has atomic number seven, and is the only aspect that can have 7 protons. The given configuration is for an isotope that nitrogen. Since there room eight neutrons, this atom would be because that nitrogen-15.


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Explanation:

Elements are shown on the regular table. Compounds room made when one or an ext element is linked to form a molecule. The the smallest unit of an element is an atom, if the the smallest unit that a link is a molecule.

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

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is a salt ion, representing one atom of salt that has actually lost an electron to obtain a hopeful charge. Though it includes only one element, it 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 also is the formula for water. Both of this compounds room composed the molecules, however hydrochloric acids has both hydrogen and chlorine atoms, and water consists of both hydrogen and also oxygen.


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Example concern #1 : Identifying aspects


Is it possible to kind a link from only one element?


Possible Answers:

No; a compound must contain many elements


Yes; compounds and elements are synonyms


Yes; benzene rings contain only carbon


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


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


Correct answer:

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


Explanation:

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

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


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Example question #1 : Elements and Atoms


Which of the complying with atomic properties, if known, will reveal the identification of the element?


Possible Answers:

More than among these answers could enable us to recognize the provided atom


The variety of electrons


The variety of protons


The atomic mass


The number of neutrons


Correct answer:

The number of protons


Explanation:

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

The variety of neutrons and variety of electrons are commonly equal to the variety of protons, however can vary depending 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 vary with the number of neutrons present and also cannot be offered to develop atomic identity.


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Example question #1 : Elements and Atoms


Which that the complying with phase labels are provided for every diatomic elements?


Possible Answers:

(s)


(aq)


(r)


(g)


(l)


Correct answer:

(g)


Explanation:

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

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.


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Example inquiry #1 : Identifying elements


What is the chemistry symbol because that potassium?


Possible Answers:

P


Na


Po


Pt


K


Correct answer:

K


Explanation:

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

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.


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Example inquiry #1 : Identifying elements


Which element also goes by its latin name, ferrum?


Possible Answers:

Iron


Lead


Platinum


Copper


Gold


Correct answer:

Iron


Explanation:

The word for iron in latin is ferrum, thus, the chemistry symbol for iron is

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 because the its latin name.


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Example inquiry #1 : Identifying aspects


Which aspect has 42 protons?


Possible Answers:

Molybdenum


Mercury


Gold


Technetium


Niobium


Correct answer:

Molybdenum


Explanation:

Remember, the variety of protons is same to the atomic variety of the element. Look at the periodic table and find the facet with atomic number 42, it synchronizes to molybdenum.

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Example inquiry #1 : Identifying aspects


Which aspect has 17 electrons?


Possible Answers:

Phosphorus


Silicon


Sulfur


Chlorine


Argon


Correct answer:

Chlorine


Explanation:

Since atoms space neutral, the variety of electrons should equal the number of protons (to balance the an adverse and confident charges). Thus the element with 17 electrons likewise has 17 protons. The variety of protons is same to the atomic variety of the element. Usage the periodic table to find the element with atom number 17, chlorine. Keep in mind that ions space not neutral, hence they have actually unequal number of protons and also electrons. Also, isotope of the same aspect contain differing numbers of neutrons, which additionally affects the weight of the isotope.


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