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alina1380 [7]
3 years ago
14

In a polar covalent bond,

Chemistry
2 answers:
Thepotemich [5.8K]3 years ago
7 0
The answer above me is incorrect. When a caption and anion are bonded, an ionic bond forms not a covalent one. Ex. NaCl

The correct answer should be B because polar means that one atom has a stronger pull on the electrons than the other atom.
almond37 [142]3 years ago
3 0

the answer is C because convalent bond is being bonded to an anion

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dmitriy555 [2]

Answer:

A. there is an isotope of lanthanum with an atomic mass of 138.9

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By knowing the different atomic masses of both Lanthanum atoms, we can not tell anything about their occurence in nature. Therefore, all the last three options are incorrect. Because, the atomic mass does not tell anything about the availability or natural abundance of an element.

Now, the isotopes of an element are those elements, which have same number of electrons and protons as the original element, but different number of neutrons. Therefore, they have same atomic number but, different atomic weight or atomic masses.

Hence, by looking at an elements having same atomic number, but different atomic masses, we can identify them as isotopes.

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<u>A. there is an isotope of lanthanum with an atomic mass of 138.9.</u>

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A.

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