Question

Which of the following elements have the same number of Neutrons? 57 Fe, 56 Fe and 58 Fe 57 Fe, 58 Co and 55 Mn 57 Fe, 56Fe and 58 Co 56 Fe, 57co and 55 Mn 56Fe, 57co and 54mn

Answer 1

Answer:

Option A:

Fe has atomic number of 26

So number of nuetron in

⁵⁷Fe = 57-26 = 31

⁵⁶Fe = 56-26 = 30

⁵⁸Fe = 58-26 = 32

So we don't have the same neutron in all the pairs

Option B:

Fe has atomic number of 26

So number of nuetron in

⁵⁷Fe = 57-26 = 31

Mn has atomic number of 25

⁵⁵Mn = 55-25 = 30

Co has atomic number of 27

⁵⁸Co = 58-27 = 31

So we don't have the same neutron in all the pairs

Option C:

Fe has atomic number of 26

So number of nuetron in

⁵⁷Fe = 57-26 = 31

⁵⁶De = 56-26 = 30

Co has atomic number of 27

⁵⁸Co = 58-27 = 31

So we don't have the same neutron in all the pairs

Option D:

Fe has atomic number of 26

So number of nuetron in

⁵⁶Fe = 56-26 = 30

Mn has atomic number of 25

⁵⁵Mn = 55-25 = 30

Co has atomic number of 27

⁵⁷Co = 57-27 = 30

So we have the same neutron in all the pairs so this should be the correct answer

Option E:

Fe has atomic number of 26

So number of nuetron in

⁵⁶Fe = 56-26 = 30

Mn has atomic number of 25

⁵⁴Mn = 54-25 = 29

Co has atomic number of 27

⁵⁷Co = 57-27 = 30

So we don't have the same neutron in all the pairs

So correct answer is fourth opiton ⁵⁶Fe, ⁵⁵Mn and ⁵⁷Co