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

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

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Number of neutrons have the right to be transformed to produce isotopes. Number of electrons can be transformed to develop ions.


Explanation:

An element is characterized by its variety of protons. Differing the variety of neutrons will readjust the isotope of an element and also varying the variety of electrons will produce an ion, but an altering the number of protons changes the identity of the facet itself. Nitrogen has atomic number seven, and is the only aspect that deserve to have 7 protons. The provided configuration is because that an isotope the nitrogen. Since there space eight neutrons, this atom would be because that nitrogen-15.


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Explanation:

Elements are presented on the periodic table. Compounds space made when one or an ext element is linked to form a molecule. The smallest unit that an element is one atom, if the smallest unit the a compound is a molecule.

Of the provided answer choices, only satisfies the inquiry criteria. This is the formula because that a molecule of bromine gas, make of two bromine atoms.

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is a salt ion, representing one atom of salt that has lost an electron to gain a optimistic charge. Despite it includes only one element, that is not a molecule.
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is a single carbon atom, and likewise does not represent a molecule.

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


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Example concern #4 : Identifying elements


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


Possible Answers:

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


No; a compound must contain lot of elements


Yes; compounds and also elements room synonyms


Yes; benzene ring contain only carbon


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


Correct answer:

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


Explanation:

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

Some compounds perform contain only one element, such as diatomic gases or graphite. Benzene rings space composed the carbon and also hydrogen, if water molecule contain hydrogen and also oxygen.


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Example inquiry #5 : Identifying facets


Which that the complying with 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 provided atom


The variety of protons


The variety of electrons


The atomic mass


The number of neutrons


Correct answer:

The variety of protons


Explanation:

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

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


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Example concern #6 : Identifying elements


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


Possible Answers:

(l)


(g)


(s)


(aq)


(r)


Correct answer:

(g)


Explanation:

Diatomic elements are frequently referred come as diatomic gases since whenever they are by themselves, they link to themselves (that is whereby the "2" subscript come from). Anytime diatomic aspects have that "2" subscript, they have the gas (g) phase label. Because that example, 

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.


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Example inquiry #7 : Identifying elements


What is the chemistry symbol because that potassium?


Possible Answers:

Na


Po


Pt


K


P


Correct answer:

K


Explanation:

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

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.


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Example question #8 : Identifying facets


Which element also 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 chemistry symbol for iron is

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 because that its latin name.


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Example question #9 : Identifying aspects


Which element has 42 protons?


Possible Answers:

Molybdenum


Mercury


Technetium


Niobium


Gold


Correct answer:

Molybdenum


Explanation:

Remember, the variety of protons is equal to the atomic variety of the element. Look at the routine table and also find the element with atomic number 42, it coincides to molybdenum.

See more: All About Dental Health: Baby Teeth Chart Letters, Which Tooth Is That


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Example question #10 : Identifying facets


Which facet has 17 electrons?


Possible Answers:

Silicon


Chlorine


Argon


Phosphorus


Sulfur


Correct answer:

Chlorine


Explanation:

Since atoms space neutral, the number of electrons should equal the variety of protons (to balance the negative and positive charges). Thus the facet with 17 electrons additionally has 17 protons. The number of protons is equal to the atomic variety of the element. Use the regular table to discover the facet with atom number 17, chlorine. Keep in mind that ions are not neutral, hence they have unequal number of protons and also electrons. Also, isotope of the same aspect contain differing number of neutrons, which additionally affects the weight of the isotope.


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