High school Chemistry help » Elements and Compounds » Elements and also Atoms » Identifying elements
Explanation:

The identification of an element is identified by the variety of protons. One cannot change the number of protons without changing the identity of the element. By adding a proton, the atom number increases by one and also the facet identity changes.

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


Explanation:

An aspect is defined by its number of protons. Varying the number of neutrons will readjust the isotope of one element and varying the number of electrons will develop an ion, but an altering the variety of protons transforms the identity of the facet itself. Nitrogen has atomic number seven, and also is the only aspect that have the right to have seven protons. The offered configuration is for an isotope the nitrogen. Because 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 room made when one or much more element is linked to type a molecule. The smallest unit of an facet is an atom, while the smallest unit of a link is a molecule.

Of the offered answer choices, just satisfies the question criteria. This is the formula because that a molecule the bromine gas, do of 2 bromine atoms.

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is a sodium ion, representing one atom of salt that has actually lost one electron to gain a positive charge. Despite it includes only one element, it is not a molecule.
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is a single carbon atom, and additionally does not stand for a molecule.

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


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Example inquiry #4 : Identifying facets


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


Possible Answers:

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


No; a compound should contain lot of elements


Yes; compounds and elements are synonyms


Yes; benzene ring contain just carbon


Yes; diatomic gases space compounds the consist of only one element


Correct answer:

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


Explanation:

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

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


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Example question #5 : Identifying aspects


Which the the complying with atomic properties, if known, will reveal the identity of the element?


Possible Answers:

More than one of these answer could allow us to determine the provided atom


The variety of protons


The number of electrons


The atom mass


The variety of neutrons


Correct answer:

The variety of protons


Explanation:

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

The variety of neutrons and variety of electrons are commonly equal come the number of protons, however can vary depending on the atom in question. Different ions and also isotopes will change the variety of neutrons and electrons, making these properties unreliable identifiers. Similarly, atom mass will vary through the number of neutrons present and cannot be provided to develop atomic identity.


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Example concern #6 : Identifying aspects


Which the the following phase brand are offered for all diatomic elements?


Possible Answers:

(l)


(g)


(s)


(aq)


(r)


Correct answer:

(g)


Explanation:

Diatomic facets are generally referred to as diatomic gases due to the fact that whenever they are by themselves, they link to us (that is whereby the "2" subscript come from). At any time diatomic elements have the "2" subscript, they have 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 for potassium?


Possible Answers:

Na


Po


Pt


K


P


Correct answer:

K


Explanation:

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

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.


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Example concern #8 : Identifying aspects


Which element also goes through 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 chemistry symbol because that iron is

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 because the its latin name.


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Example concern #9 : Identifying elements


Which aspect has 42 protons?


Possible Answers:

Molybdenum


Mercury


Technetium


Niobium


Gold


Correct answer:

Molybdenum


Explanation:

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

See more: What Happened In 1917 That Ended The Stalemate, British Library


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Example inquiry #10 : Identifying aspects


Which facet has 17 electrons?


Possible Answers:

Silicon


Chlorine


Argon


Phosphorus


Sulfur


Correct answer:

Chlorine


Explanation:

Since atoms room neutral, the number of electrons should equal the number of protons (to balance the an unfavorable and optimistic charges). Thus the facet with 17 electrons additionally has 17 protons. The number of protons is same to the atomic number of the element. Usage the periodic table to find the aspect with atom number 17, chlorine. Keep in mind that ions space not neutral, therefore they have unequal number of protons and also electrons. Also, isotope of the same element contain differing numbers of neutrons, which likewise affects the load of the isotope.


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