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2 years ago

If an isotope of an element has 33 neutrons and a mass number of 64, how many electrons must it have?

2 answers:

7 0

The mass number is the sum of the protons and neutrons
64 = #protons + #neutrons
Find the number of protons given the number of neutrons
64 = #protons + 33
#protons = 31
In a neutral element (such as this), the number of electrons equals the number of protons
#electrons = #protons
#electrons = 31

andrew-mc [135]2 years ago

6 0

Answer:

The isotope must have 31 electrons

Explanation:

Mass number = (number of neutrons)+(number of protons)
Here, mass number of element is 64 and number of neutrons is 33
So, number of protons i the element = (mass number)-(number of neutrons) = (64)-(33) = 31
Isotope of an element remain present in neutral form.
So, number of protons should be equal to number of electrons in that isotope. Because proton has +1 charge and electron has -1 charge
So, the isotope must have 31 electrons.

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2 years ago

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Usually hard but brittle Ionic or covalent

aleksandrvk [35]

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3 years ago

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1) A mixture of anhydrous sodium carbonate and sodium hydrogencarbonate of mass 10.000 g was heated until it reached a constant

vodomira [7]

The masses of the components are obtained as;

Sodium hydrogen carbonate = 3.51 g
Sodium carbonate = 8.708 g

<h3>What is decomposition?</h3>

The term decomposition has to do with the breakdown of the given substance into its components. The components of sodium hydrogen carbonate could be identified as water vapor, carbon dioxide gas and sodium carbonate. Among these products that have been listed here, we can see that it is only the sodium carbonate that remains as a solid. The others are gases that move away from the system that is under study.

Now putting down the equation of the reaction, we have;

$2NaHCO_{3} (s) ----- > Na_{2} CO_{3} (s) + CO_{2} (g) + H_{2} O(g)$

Now, the loss in mass must be due to the carbon dioxide and the water. Hence we obtain the loss in mass to be 10.000 g - 8.708 g = 1.292 g

Mass of sodium hydrogen carbonate = 2 * 88 g/mol * 1.292 g/62 g/mol

= 3.51 g

Learn more about anhydrous sodium carbonate :brainly.com/question/20479996

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8 months ago