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

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

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


Explanation:

An aspect is defined by its number of protons. Varying the variety of neutrons will adjust the isotope of one element and also varying the number of electrons will develop an ion, but changing the variety of protons transforms the identification of the aspect itself. Nitrogen has actually atomic number seven, and is the only element that can have seven protons. The given configuration is because that an isotope of nitrogen. Due to the fact that there are eight neutrons, this atom would certainly be because that nitrogen-15.


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Explanation:

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

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

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is a sodium ion, representing one atom of salt that has lost an electron to obtain a positive charge. Despite it consists of only one element, it is no a molecule.
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is a single carbon atom, and additionally does not represent a molecule.

is the formula because that hydrochloric acid and also is the formula because that water. Both of these compounds space composed of molecules, but hydrochloric acids has both hydrogen and also chlorine atoms, and water consists of both hydrogen and also oxygen.


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Example inquiry #4 : Identifying facets


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


Possible Answers:

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


No; a compound need to contain many elements


Yes; compounds and also elements are synonyms


Yes; benzene ring contain just carbon


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


Correct answer:

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


Explanation:

Elements are defined by the number of protons in a given atom, and the atom is the smallest unit of one element. In contrast, a compound is identified by the identity and organization of multiple atoms, with the smallest unit of a compound being a molecule.

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


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Example concern #5 : Identifying facets


Which of the following atomic properties, if known, will disclose the identity of the element?


Possible Answers:

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


The variety of protons


The number of electrons


The atomic mass


The variety of neutrons


Correct answer:

The variety of protons


Explanation:

There are two nature that can be used to identify an element: the atomic number or the number of protons in an atom.

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


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Example concern #6 : Identifying aspects


Which the the adhering to phase labels are used for every diatomic elements?


Possible Answers:

(l)


(g)


(s)


(aq)


(r)


Correct answer:

(g)


Explanation:

Diatomic aspects are typically referred come as diatomic gases because whenever they space by themselves, they link to themselves (that is wherein the \"2\" subscript come from). Whenever diatomic facets have that \"2\" subscript, they have the gas (g) phase label. Because that example, 

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.


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Example concern #7 : Identifying facets


What is the chemistry symbol for potassium?


Possible Answers:

Na


Po


Pt


K


P


Correct answer:

K


Explanation:

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

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.


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Example question #8 : Identifying facets


Which element additionally goes by its latin name, ferrum?


Possible Answers:

Platinum


Copper


Lead


Gold


Iron


Correct answer:

Iron


Explanation:

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

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 because the its latin name.


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Example question #9 : Identifying facets


Which facet has 42 protons?


Possible Answers:

Molybdenum


Mercury


Technetium


Niobium


Gold


Correct answer:

Molybdenum


Explanation:

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

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Example question #10 : Identifying aspects


Which element has 17 electrons?


Possible Answers:

Silicon


Chlorine


Argon


Phosphorus


Sulfur


Correct answer:

Chlorine


Explanation:

Since atoms space neutral, the variety of electrons should equal the variety of protons (to balance the negative and hopeful charges). Hence the aspect with 17 electrons likewise has 17 protons. The variety of protons is equal to the atomic number of the element. Usage the periodic table to discover the facet with atomic number 17, chlorine. Note that ions room not neutral, therefore they have unequal numbers of protons and electrons. Also, isotope of the same element contain differing numbers of neutrons, which likewise affects the weight of the isotope.


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