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Yuki888 [10]
3 years ago
14

Which two notations represent isotopes of the same element

Chemistry
2 answers:
Akimi4 [234]3 years ago
7 0

The two notations that represent isotopes of the same element is \boxed{_{\text{7}}^{{\text{14}}}{\text{N and }}_{\text{7}}^{{\text{18}}}{\text{N}}}

Further explanation:

An atom is also written as _{\text{Z}}^{\text{A}}{\text{X}}, where A is the mass number, Z is the atomic number, and X is the letter symbol of the element.

Isotopes:

Atoms of the same element with <em>same atomic number</em> but <em>different mass numbers</em> are called isotopes. Isotopes have the equal number of protons but the number of neutrons is different.

_{\mathbf{6}}^{{\mathbf{11}}}{\mathbf{C}} and _{\mathbf{6}}^{{\mathbf{12}}}{\mathbf{C}} are examples of isotopes. Both are the atoms of the same element carbon. The mass number of _6^{11}{\text{C}} is 11 while that of _6^{12}{\text{C}} is 12. But both of these have the same atomic number and that is 6.

(1) _{\mathbf{7}}^{{\mathbf{14}}}{\mathbf{ N and }}_{\mathbf{7}}^{{\mathbf{18}}}{\mathbf{N}}

Here, both elements are the same (nitrogen). The atomic numbers of both nitrogens are same. But the atomic mass or mass number of _7^{14}{\text{N}} is 14 while that of _7^{18}{\text{N}} is 18. So both the notations have the same atomic number and different mass numbers. So this pair completely satisfies the definition of isotopes and therefore it is a correct option.

(2) _{\mathbf{7}}^{{\mathbf{14}}}{\mathbf{ Nand }}_{{\mathbf{10}}}^{{\mathbf{17}}}{\mathbf{Ne}}

Here, both elements are not the same. One element is nitrogen while the other one is neon. The atomic numbers of both elements are different. The atomic number of nitrogen atom is 7 while that of neon is 10. The atomic masses of both elements are also different. So this pair does not satisfy the definition of isotopes and therefore, it is an incorrect option.

(3) _{\mathbf{7}}^{{\mathbf{20}}}{\mathbf{N and }}_{{\mathbf{10}}}^{{\mathbf{20}}}{\mathbf{Ne}}

Here, both elements are not the same. One element is nitrogen while the other one is neon. The atomic numbers of both elements are different. The atomic number of nitrogen atom is 7 while that of neon is 10. The atomic masses of both elements are same. So this pair does not satisfy the definition of isotopes and therefore it is an incorrect option.

(4) _{\mathbf{7}}^{{\mathbf{19}}}{\mathbf{N and }}_{{\mathbf{10}}}^{{\mathbf{16}}}{\mathbf{Ne}}

Here, both elements are not the same. One element is nitrogen while the other one is neon. The atomic numbers of both elements are different. The atomic number of nitrogen atom is 7 while that of neon is 10. The atomic masses of both elements are also different. So this pair does not satisfy the definition of isotopes and therefore, it is an incorrect option.

Learn more:

1. Forces in ionic compounds: brainly.com/question/7007192

2. Reason for the acidic and basic nature of amino acid: brainly.com/question/5050077

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Atomic structure

Keywords: isotopes, same element, notations, represent, same atomic number, different mass numbers, A, Z, X, nitrogen, neon, 7, 10, correct, incorrect.

Mumz [18]3 years ago
6 0
The two notations that represent isotopes of the same element is the one that represented in option 1
The lower number is the number of protons while the upper number is the atomic weight

hope this helps
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<u>Explanation:</u>

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  • <u>Anions:</u> They are formed when an atom gain electrons in its outermost shell. They are negative ions.

For positive ions, the removal of electron increases the nuclear charge for an outermost electron because the outermost electrons are more strongly attracted by the nucleus. So, the effective nuclear charge increases for cations and thus, the size of the cation will be smaller than that of the corresponding atom.

For negative ions, the addition of electron decreases the nuclear charge for an outermost electron because the outermost electrons are less strongly attracted by the nucleus. So, the effective nuclear charge decreases for anions and thus, the size of the anion will be larger than that of the corresponding atom.

For the given options:

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<u>Option b:</u> Sodium

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Step-by-step explanation:

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