High college Chemistry aid » Elements and also Compounds » Elements and Atoms » Identifying elements
Explanation:

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

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Number that neutrons have the right to be altered to produce isotopes. Variety of electrons can be transformed to develop ions.


Explanation:

An facet is characterized by its number of protons. Varying the variety of neutrons will adjust the isotope of one element and varying the number of electrons will produce an ion, but changing the variety of protons alters the identification of the facet itself. Nitrogen has actually atomic number seven, and also is the only element that have the right to have 7 protons. The provided configuration is because that an isotope the nitrogen. Since there space eight neutrons, this atom would be because that nitrogen-15.


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Explanation:

Elements are presented on the periodic table. Compounds are made as soon as one or much more element is combined to type a molecule. The the smallest unit the an element is an atom, if the smallest unit the a link is a molecule.

Of the offered answer choices, just satisfies the inquiry criteria. This is the formula for a molecule the bromine gas, make of two bromine atoms.

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is a salt ion, representing one atom of salt that has lost one electron to obtain a hopeful charge. Though it consists of only one element, that is not a molecule.
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is a solitary carbon atom, and likewise does not represent a molecule.

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


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Example question #1 : Identifying facets


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


Possible Answers:

No; a compound have to contain many elements


Yes; compounds and also elements are synonyms


Yes; benzene ring contain only carbon


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


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


Correct answer:

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


Explanation:

Elements are characterized by the variety of protons in a provided atom, and the atom is the smallest unit of one element. In contrast, a link is characterized by the identity and organization of many atoms, with the the smallest unit the a link being a molecule.

Some compounds carry out contain only one element, such as diatomic gases or graphite. Benzene rings room composed the carbon and hydrogen, if water molecule contain hydrogen and also oxygen.


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Example concern #1 : Elements and Atoms


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


Possible Answers:

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


The variety of electrons


The number of protons


The atom mass


The variety of neutrons


Correct answer:

The number of protons


Explanation:

There room two nature that have the right to be used to identify an element: the atom number or the variety of protons in one atom.

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


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Example question #1 : Understand an easy Chemistry


Which that the adhering to phase labels are offered for all diatomic elements?


Possible Answers:

(g)


(aq)


(r)


(s)


(l)


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 whereby the "2" subscript comes from). Whenever diatomic elements have that "2" subscript, they have actually the gas (g) phase label. For example, 

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.


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Example inquiry #1 : Identifying aspects


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 because that potassium, kalium. The is why the chemistry symbol for potassium is

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.


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Example inquiry #1 : Identifying aspects


Which element additionally goes through its latin name, ferrum?


Possible Answers:

Iron


Lead


Platinum


Copper


Gold


Correct answer:

Iron


Explanation:

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

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 because of its latin name.


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Example inquiry #1 : Identifying elements


Which facet has 42 protons?


Possible Answers:

Molybdenum


Mercury


Gold


Technetium


Niobium


Correct answer:

Molybdenum


Explanation:

Remember, the number of protons is same to the atomic number of the element. Look in ~ the regular table and also find the aspect with atom number 42, it coincides to molybdenum.

See more: Business St A Null Hypothesis Makes A Claim About A Mples, Hypothesis Testing


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Example concern #1 : Identifying facets


Which aspect has 17 electrons?


Possible Answers:

Phosphorus


Sulfur


Silicon


Argon


Chlorine


Correct answer:

Chlorine


Explanation:

Since atoms space neutral, the variety of electrons need to equal the variety of protons (to balance the negative and hopeful charges). For this reason the element with 17 electrons likewise has 17 protons. The number of protons is same to the atomic number of the element. Usage the regular table to find the facet with atomic number 17, chlorine. Note that ions space not neutral, thus they have unequal numbers of protons and also electrons. Also, isotope of the same aspect contain differing numbers of neutrons, which likewise affects the weight of the isotope.


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