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Rudiy27
4 years ago
15

Given an element’s atomic number and mass number, how can you tell the number of protons and neutrons in its nucleus?

Chemistry
2 answers:
hram777 [196]4 years ago
8 0
Are there any choices or is that the only part of the question?

Charra [1.4K]4 years ago
4 0

Explanation:

Atomic number is the number of protons present in an atom. Whereas mass number is the sum of total number of protons and neutrons present in an atom.

For example, atomic number of bromine is 35, that is, there are 35 protons present in a bromine atom. The mass number of bromine is 80.

So,     Mass number = no. of protons + no. of neutrons

                 no. of neutrons = mass number - no. of protons

                                            = 80 - 35

                                            = 45

Hence, in a bromine atom there are 35 protons and 45 neutrons.                

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Polonium-208 undergoes alpha decay. In addition to the alpha
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Answer:

C

Explanation:

C

7 0
3 years ago
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A tank of water was contaminated with a colored dye (D). To determine the concentration of D, an analyst took 5.0-mL solution fr
alekssr [168]

Answer:

0.005 M

Explanation:

Given data:

volume of sample solution ( volume of D ) = 5.0 mL

volume of added stock solution ( V1 ) = 5.0 mL

concentration of added stock solution ( N1 )  = 0.02 M

Total volume of concentration  ( V2 )= 10 mL = ( 5.0 mL + 5.0mL)

concentration of Total volume of sample ( C2 ) = 0.01

N2 = ( N1V1 ) / V2

     = ( 0.02 * 5 ) / 10 = 0.01 m

absorbance of sample solution ( A1 ) = 0.10

absorbance of additional sample solution ( A2 ) = 0.20

attached below is the remaining part of the detailed solution

3 0
3 years ago
Air is made up mostly of O2, N2, and CO2. If the total pressure of air is 765mmHg and P(N2) = 0.79 atm and P(CO2) = 0.05 atm, th
Mrac [35]

Answer:

the partial pressure of the O2 is 0.167 atm

Explanation:

The computation of the partial pressure of the O2 is shown below:

As we know that

P = P_N2 + P_O2 + P_CO2

P_O2 = P - P_N2 -  P_CO2

= (1.007 - 0.79 - 0.05)

= 0.167 atm

Hence, the partial pressure of the O2 is 0.167 atm

we simply applied the above formula

5 0
3 years ago
sucrose (sugar)crystals obtained from sugarcane and bet root are mixed together .with it be a pure substancesor a mixture ?give
Vesnalui [34]

Answer:

It will be a pure substance (compound) because chemical composition of sugar crystals will be the same whether obtained from sugarcane or from beet root.

<h3>hope it's help you </h3><h3>plz mark as brain list ...!!</h3>
5 0
3 years ago
How do you find the average atomic mass?
grin007 [14]

To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.

6 0
3 years ago
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