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

The identity of an aspect is determined by the variety of protons. One cannot alter the variety of protons without altering the identification of the element. By adding a proton, the atomic number rises by one and the aspect identity changes.

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Number of neutrons can be transformed to produce isotopes. Number of electrons can be changed to produce ions.


Explanation:

An element is defined by its variety of protons. Varying the number of neutrons will readjust the isotope of an element and varying the variety of electrons will create an ion, but changing the variety of protons alters the identification of the aspect itself. Nitrogen has actually atomic number seven, and also is the only element that can have 7 protons. The given configuration is for an isotope the nitrogen. Due to the fact that there are eight neutrons, this atom would certainly be for nitrogen-15.





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Explanation:

Elements are displayed on the periodic table. Compounds room made once one or an ext element is linked to kind a molecule. The the smallest unit that an facet is an atom, if the smallest unit of a compound is a molecule.

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

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is a sodium ion, representing one atom of sodium that has lost an electron to gain a optimistic charge. Though it consists of only one element, that is not a molecule.
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is a solitary 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 are composed the molecules, but hydrochloric acids includes both hydrogen and chlorine atoms, and water has both hydrogen and also oxygen.


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Example inquiry #1 : Identifying facets


Is it feasible to kind a link from just one element?


Possible Answers:

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


Yes; benzene rings contain only carbon


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


Yes; compounds and elements are synonyms


No; a compound must contain multiple elements


Correct answer:

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


Explanation:

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

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


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Example concern #5 : Identifying elements


Which that the following atomic properties, if known, will expose the identification of the element?


Possible Answers:

More than one of these answers could allow us to recognize the offered atom


The variety of protons


The atomic mass


The number of electrons


The variety of neutrons


Correct answer:

The variety of protons


Explanation:

There space two nature that deserve to be offered to identify an element: the atomic number or the variety of protons in one atom.

The variety of neutrons and number of electrons are generally equal to the number of protons, however can vary relying on the atom in question. Various ions and isotopes will change the number of neutrons and electrons, making this properties unreliable identifiers. Similarly, atomic mass will vary v the variety of neutrons present and cannot be supplied to create atomic identity.


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Example concern #6 : Identifying elements


Which of the complying with phase brand are provided for every diatomic elements?


Possible Answers:

(r)


(aq)


(g)


(l)


(s)


Correct answer:

(g)


Explanation:

Diatomic elements are frequently referred to as diatomic gases due to the fact that whenever they room by themselves, they link to us (that is wherein the "2" subscript comes from). At any time diatomic elements have that "2" subscript, they have actually the gas (g) phase label. Because that example, 

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.


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Example question #7 : Identifying aspects


What is the chemistry symbol because that potassium?


Possible Answers:

P


Pt


Po


Na


K


Correct answer:

K


Explanation:

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

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.


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Example inquiry #8 : Identifying aspects


Which element also goes by its latin name, ferrum?


Possible Answers:

Iron


Platinum


Lead


Gold


Copper


Correct answer:

Iron


Explanation:

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

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 because the its latin name.


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Example inquiry #9 : Identifying facets


Which element has 42 protons?


Possible Answers:

Technetium


Mercury


Molybdenum


Gold


Niobium


Correct answer:

Molybdenum


Explanation:

Remember, the number of protons is equal to the atomic number of the element. Look at the periodic table and find the facet with atom number 42, it corresponds to molybdenum.

See more: What Is 17 Is What Percent Of 24 ? Calculate 17% Of 24 How Much Is 17 Out Of 24


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Example inquiry #10 : Identifying elements


Which aspect has 17 electrons?


Possible Answers:

Argon


Silicon


Sulfur


Phosphorus


Chlorine


Correct answer:

Chlorine


Explanation:

Since atoms space neutral, the variety of electrons must equal the variety of protons (to balance the an unfavorable and hopeful charges). Thus the aspect with 17 electrons likewise has 17 protons. The variety of protons is same to the atomic variety of the element. Use the routine table to discover the facet with atom number 17, chlorine. Note that ions space not neutral, for this reason they have actually unequal numbers of protons and also electrons. Also, isotope of the same element contain differing number of neutrons, which additionally affects the weight of the isotope.


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