If magnesium atom having atomic number 12 has an isotope with mass number 26, then the number of protons, neutrons and electrons respectively of the atom are

Question

If magnesium atom having atomic number 12 has an isotope with mass number 26, then the number of protons, neutrons and electrons respectively of the atom are (A) 12, 14, 12 (B) 12, 12, 14 (C) 14, 12, 12 (D) 12, 12, 12

Tardigrade Admin · Accepted Answer

Isotopes are nuclei that have same atomic number but different atomic mass.

∴

Atomic number of the isotope

= 12

\Rightarrow

Number of electrons and protons

= 12

Number of neutrons

=

At. mass

-

Atomic no.

= 26 - 12 = 14

Q. If magnesium atom having atomic number 12 has an isotope with mass number 26, then the number of protons, neutrons and electrons respectively of the atom are

12, 14, 12

12, 12, 14

14, 12, 12

12, 12, 12

Isotopes are nuclei that have same atomic number but different atomic mass. ∴ Atomic number of the isotope =12 ⇒ Number of electrons and protons =12 Number of neutrons = At. mass − Atomic no. =26−12=14

Q. If magnesium atom having atomic number $12$ has an isotope with mass number $26$ , then the number of protons, neutrons and electrons respectively of the atom are

Isotopes are nuclei that have same atomic number but different atomic mass.

$∴$ Atomic number of the isotope $= 12$

$\Rightarrow$ Number of electrons and protons $= 12$

Number of neutrons $=$ At. mass $-$ Atomic no.

$= 26 - 12 = 14$