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lawyer [7]
3 years ago
11

Why does the mass number equal the total number of protons and neutrons? and what is mass number of atoms expressed in the Perio

dic table?
Chemistry
1 answer:
Alexandra [31]3 years ago
5 0

The mass number is equal to the number of protons plus the number of neutrons. From the periodic table, we can see that chromium has an atomic number of 24, which means its nucleus contains 24 protons. ... Therefore, the chromium-52 isotope contains 28 neutrons in its nucleus.

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Which of these is a physical property?
Crazy boy [7]

Answer:

malleable

Explanation:

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4 years ago
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Wich reason is the best for choosing the ruler to measure the dimensionof tbe wooden block
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It will always produce a near-exact measurement
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4 years ago
Acetylene gas is often used in welding torches because of the very high heat produced when it reacts with oxygen gas, producing
UkoKoshka [18]

<u>Answer:</u> 1.2 moles of carbon dioxide is produced for the given value of oxygen.

<u>Explanation:</u>

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2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O

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4 years ago
1.-Identifica y menciona los elementos que
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3 years ago
A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide?
Aleksandr [31]

<em>Answer:</em>

Symbol =  I

<em>Explanation:</em>

<em>Isotopes</em> are those substances which have same atomic number (Numbers of protons) and different masses (Number of proton + numbers of neutrons).

  • Iodine also have many isotopes like

<em>Iodine-125</em> that contain 53 protons, 72 neutrons.

<em>Iodine-128</em>  that contain 53 protons, 75 neutrons.

<em>Iodine-129 </em> that contain 53 protons, 76 neutrons.

<em>Iodine-131</em> that contain 53 protons, 78 neutrons.

<em>Summary:</em>

  • Here the Iodine-131 is correct answer of this question.

5 0
4 years ago
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