Two atoms are isotopes if they have the same: mass number, but different atomic

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Two atoms are isotopes if they have the same: mass number, but different atomic number number of electrons, protons, and neutrons number of neutrons. but. a different number of protons number of protons, but a different number of neutrons none of these An atomic particle having 30 protons, 35 neutrons, and 28 electrons has a charge of +2 an atomic no. of 35 a mass no. of 30 an atomic no. of 28 none of these The number of neutrons in Br-80 is: 115 80 45 35 none The correct name for K_2SO_4 is: potassium sulfate dipotassium sulfate potassium sulfite none of these The correct name for N_2O_5 is: nitric oxide nitrogen pentoxide nitrous oxide none of these The formula for calcium nitrate is: Ca(NO_3)_2 CaNO_3 Ca_3(NO_3)_2 Ca_2NO_3 none of these The chemical properties of an element are primarily dependent upon: The electronic configuration of the element The number of neutrons present The number of electrons in the innermost shell of the atom The number of principal (main) energy levels of the element None of these

Explanation / Answer

Answers  

1. ...........(d) ..... same number of protons but different number of neutrons

Since isotopes of an element have same atomic number , each of these contain equal number of protons. They have different atomic masses which is accounted for by different number of neutrons present in the nucleus. Isotopes of an element are , therefore , charecterized by different number of neutrons in the nucleus.

2. .......... (a) .... a charge of +2

The number of proton = atomic number = 30

therefore, it refers to the element Zn which is dipositive ie. yields Zn2+ ions

3, .......... (c) .... 45   

The number of neutrons = Mass number - atomic number

........................................= ( 80 -35 )

.........................................= 45

4. .......... (a) ..... potassium sulphate   

Although K2 SO4 can also be named as dipotassium sulphate , but being an ionic compound it would not be necessary to mention the number of Potassium ions or atom , since it goes without telling that potassium is univalent positive ion (K+) & sulphate is divalent negative ion (SO42- ) in the molecule. Hence , the correct name has been identified as " potassium sulphate ''

5. .......... (c) ..... Dinitrogen pentaoxide   

being a covalent compound it is better named mentioning the number of nitrogen & oxygen atoms present in a molecule of N2 O5

6. .......... (a) ..... Ca ( NO3 )2

   because calcium is dipositive (Ca2+ ) & the nitrate ion ( NO3- ) is monovalent.

7. ....... (a) .... electronic configuration of the element

Electronic configuration of an element has a close relationship with the chemical properties of an element.   

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