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

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

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


Explanation:

An facet is characterized by its variety of prolots. Varying the number of neutrons will adjust the isotope of an element and also varying the number of electrons will produce an ion, however changing the number of proloads transforms the identity of the aspect itself. Nitrogen has atomic number salso, and also is the just aspect that have the right to have actually seven proloads. The offered configuration is for an isotope of nitrogen. Due to the fact that tbelow are eight neutrons, this atom would be for nitrogen-15.


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Explanation:

Elements are displayed on the periodic table. Compounds are made when one or more element is unified to develop 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 selections, just satisfies the question criteria. This is the formula for a molecule of bromine gas, made of two bromine atoms.

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is a sodium ion, representing one atom of sodium that has shed an electron to get a positive charge. Though it consists of only one element, it is not a molecule.
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is a single carbon atom, and also additionally does not represent a molecule.

is the formula for hydrochloric acid and is the formula for water. Both of these compounds are created of molecules, but hydrochloric acids has both hydrogen and also chlorine atoms, and also water has both hydrogen and also oxygen.


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Example Concern #1 : Identifying Elements


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


Possible Answers:

No; a compound need to contain multiple elements


Yes; compounds and also elements are synonyms


Yes; benzene rings contain only carbon


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


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


Correct answer:

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


Explanation:

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

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


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Example Question #1 : Elements And Atoms


Which of the complying with atomic properties, if recognized, will certainly expose the identification of the element?


Possible Answers:

More than among these answers can allow us to identify the given atom


The number of electrons


The number of protons


The atomic mass


The variety of neutrons


Correct answer:

The variety of protons


Explanation:

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

The number of neutrons and number of electrons are typically equal to the number of prolots, however deserve to vary relying on the atom in question. Different ions and also isotopes will certainly transform the number of neutrons and also electrons, making these properties untrusted identifiers. Similarly, atomic mass will vary via the number of neutrons present and also cannot be offered to establish atomic identification.


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Example Concern #1 : Elements And Atoms


Which of the following phase labels are used for all diatomic elements?


Possible Answers:

(s)


(aq)


(r)


(g)


(l)


Correct answer:

(g)


Explanation:

Diatomic facets are generally described as diatomic gases because whenever before they are by themselves, they bond to themselves (that is wbelow the "2" submanuscript comes from). Anytime diatomic elements have that "2" subscript, they have actually the gas (g) phase label. For instance, 

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

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Example Concern #1 : Identifying Elements


Which element likewise 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 chemical symbol for iron is

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 bereason 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 prolots is equal to the atomic number of the facet. Look at the periodic table and find the aspect via atomic number 42, it corresponds to molybdenum.

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Example Inquiry #1 : Identifying Elements


Which element has 17 electrons?


Possible Answers:

Phosphorus


Silicon


Sulfur


Chlorine


Argon


Correct answer:

Chlorine


Explanation:

Because atoms are neutral, the variety of electrons should equal the variety of protons (to balance the negative and positive charges). Therefore the aspect via 17 electrons also has actually 17 proloads. The variety of prolots is equal to the atomic number of the aspect. Use the periodic table to discover the facet with atomic number 17, chlorine. Note that ions are not neutral, thus they have unequal numbers of protons and also electrons. Also, isotopes of the same element contain differing numbers of neutrons, which also affects the weight of the isotope.


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