High School Chemisattempt Assistance » Elements and also Compounds » Elements and also Atoms » Identifying Elements
Explanation:

The identity of an aspect is established by the number of protons. One cannot change the number of proloads without transforming the identity of the aspect. By adding a proton, the atomic number rises by one and the element identity alters.

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


Explanation:

An facet is characterized by its variety of proloads. Varying the number of neutrons will change the isotope of an element and varying the variety of electrons will certainly create an ion, but transforming the variety of proloads changes the identification of the facet itself. Nitrogen has actually atomic number salso, and also is the just aspect that can have salso proloads. The provided configuration is for an isotope of nitrogen. Because there are eight neutrons, this atom would certainly be for nitrogen-15.


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Explanation:

Elements are presented on the regular table. Compounds are made when one or even more element is combined to create a molecule. The smallest unit of an facet is an atom, while the smallest unit of a compound is a molecule.

Of the offered answer options, just satisfies the question criteria. This is the formula for a molecule of bromine gas, made of 2 bromine atoms.

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is a sodium ion, representing one atom of sodium that has actually shed an electron to get a positive charge. Though it contains just one aspect, it is not a molecule.
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is a single carbon atom, and additionally does not reexisting a molecule.

is the formula for hydrochloric acid and also is the formula for water. Both of these compounds are written of molecules, however hydrochloric acids includes both hydrogen and chlorine atoms, and water consists of both hydrogen and also oxygen.


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Example Question #1 : Identifying Elements


Is it feasible to create a compound from just one element?


Possible Answers:

No; a compound must contain multiple elements


Yes; compounds and aspects are synonyms


Yes; benzene rings contain just carbon


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


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


Correct answer:

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


Explanation:

Elements are identified by the variety of proloads in a offered atom, and also the atom is the smallest unit of an facet. In comparison, a compound is identified by the identity and company of multiple atoms, with the smallest unit of a compound being a molecule.

Some compounds execute contain only one aspect, such as diatomic gases or graphite. Benzene rings are written of carbon and hydrogen, while water molecules contain hydrogen and oxygen.


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Example Concern #1 : Elements And Atoms


Which of the following atomic properties, if recognized, will disclose the identification of the element?


Possible Answers:

More than one of these answers can allow us to recognize the given atom


The number of electrons


The number of protons


The atomic mass


The variety of neutrons


Correct answer:

The number of protons


Explanation:

Tbelow are 2 properties that deserve to be offered to determine an element: the atomic number or the number of protons in an atom.

The variety of neutrons and also variety of electrons are commonly equal to the number of protons, however can vary relying on the atom in question. Different ions and also isotopes will alter the number of neutrons and electrons, making these properties untrustworthy identifiers. Similarly, atomic mass will certainly vary via the number of neutrons current and cannot be offered to create atomic identity.


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Example Inquiry #1 : Identifying Elements


Which of the adhering to phase labels are supplied for all diatomic elements?


Possible Answers:

(r)


(aq)


(s)


(l)


(g)


Correct answer:

(g)


Explanation:

Diatomic facets are typically referred to as diatomic gases bereason whenever they are by themselves, they bond to themselves (that is wright here the "2" subscript comes from). Anytime diatomic facets have actually that "2" subscript, they have actually the gas (g) phase label. For instance, 

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.


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Example Question #1 : Identifying Elements


What is the chemical symbol for potassium?


Possible Answers:

P


Na


Po


Pt


K


Correct answer:

K


Explanation:

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

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.


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Example Concern #1 : Identifying Elements


Which aspect 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, hence, the chemical symbol for iron is

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 because of its latin name.


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Example Question #1 : Identifying Elements


Which aspect has 42 protons?


Possible Answers:

Molybdenum


Mercury


Gold


Technetium


Niobium


Correct answer:

Molybdenum


Explanation:

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

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Example Question #1 : Identifying Elements


Which aspect has 17 electrons?


Possible Answers:

Phosphorus


Silicon


Sulfur


Chlorine


Argon


Correct answer:

Chlorine


Explanation:

Due to the fact that atoms are neutral, the variety of electrons need to equal the variety of protons (to balance the negative and also positive charges). Thus the facet through 17 electrons likewise has 17 proloads. The number of protons is equal to the atomic number of the facet. Use the regular table to uncover the facet via atomic number 17, chlorine. Keep in mind that ions are not neutral, thus they have actually unequal numbers of proloads and also electrons. Also, isotopes of the exact same element contain differing numbers of neutrons, which additionally affects the weight of the isotope.


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