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3 years ago

Atmos of given elements will have the same mass true or false .

Chemistry

2 answers:

Shkiper50 [21]3 years ago

8 0

True because,

Atoms of different elements have different masses because different atoms have a different number of subatomic particles i.e neutrons, protons and electrons.

Atomic mass of an element cannot be same as the mass of a single atom of that element because by investigation of mass spectrometry it was found that many naturally occurring elements exist in the form of two or more isotopes. Isotopes are the atoms of the same elements having the same atomic number containing the same number of protons but the different number of neutrons and because of this, it possesses different mass number. So, the observed atomic mass of the atom of an element is the average atomic mass of the elements. Average of masses of a different isotope of the same element is taken and then the atomic mass of the element is decided.

A formula to calculate average atomic mass:-

Example:-

Lithium exists in nature in the form of two isotopes Li−6 and Li−7 with atomic masses 6.0151u and 7.0160u and the percentages 7.59 and 92.41 respectively.

Solution:- Average atomic mass of Li

[Atomic mass of Li−6× percentage + Atomic mass of Li−7× percentage]/100

100

6.015u×7.59+7.0160u×92.41

=6.939u

Hence, the atomic mass of an element is not the same as the mass of a single atom of that element; Atomic mass is average of isotopic mass o atoms.

strojnjashka [21]3 years ago

8 0

Answer:

TRUE BRUHHHH maybe

Explanation:

TRUE BRUHHHHHHHGGGHHHGHGHGHGHHHHHHHHHHHHHHHHHHHHHHH

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Answer:

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Explanation:

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3 years ago

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3 years ago

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sertanlavr [38]

Answer:

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Explanation:

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Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

In given reaction fluorine gas gain two electron and form fluoride ions.

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3 years ago

Level 1 01 Which correctly pairs the outside particles with their charge? A. Electrons: Positive B. Protons: Positive C. Neutron

DochEvi [55]

Answer:

D. Electrons: Negative.

Explanation:

Hello, happy to help you today!

In this case, by considering the Bohr's atomic model in which atom is composed by a nuclei containing both protons and neutrons which are positively and neutrally charged respectively and surrounding electrons assembled in orbits or levels of energy which are negatively charged in order to provide a balance to the atom, the correct statement is: D. Electrons: Negative. Also consider the Bohr's model on the attached picture.

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3 years ago

Sodium only has one naturally occuring isotope, Na23 , with a relative atomic mass of 22.9898 u. A synthetic, radioactive isotop

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Answer:

0.000399316 g

Explanation:

We can start with the molar fraction for each isotope:

We can say that the abudandance of $^2^3Na$ is an unknow value "X" and the molar fraction of $^2^2Na$ is "Y". We have to keep in mind that the molar fractions can be added: