Answer:
Isotopes of the same elements are different because although they have the same number of protons and electrons, they have a different number of neutrons
Explanation:
The number of neutrons in the nucleus determines the specific isotope of an element. The only difference between isotopes of an element is the number of neutrons present.
<u>Answer:</u> The isotope produced after the transmutation process of Cf-249 and C-12 is 
<u>Explanation:</u>
Transmutation is defined as the process where one chemical isotope gets converted to another chemical isotope. The number of protons or neutrons in the isotope gets changed.
The chemical equation for the reaction of Californium-249 nucleus with Carbon-12 nucleus follows:

In a nuclear reaction, the total mass and total atomic number remains the same.
<u>To calculate A:</u>
Total mass on reactant side = total mass on product side
249 + 12 = A + 4
A = 257
<u>To calculate Z:</u>
Total atomic number on reactant side = total atomic number on product side
98 + 6 = Z + 0
Z = 104
Hence, the isotope produced after the transmutation process of Cf-249 and C-12 is 
If your question is of the core of the Earth, it is suspected to be made of iron and nickel.
Answer:
No of Moles in excess at the end of the reaction is 0.25 moles
Explanation:
AgNO3 + Mg3P2 → Ag3P + Mg(NO3)2
Balancing the equation we get
6AgNO3 + Mg3P2 → 2Ag3P + 3Mg(NO3)2
6 moles of AgNO3 needs 1 mole of Mg3P2
using unitary method
AgNO3 = 
1.5 AgNO3 =
= 1/4 = 0.25moles of Mg3P2
So 1.5 Moles of AgNO3 requires 0.25Mg3P2 for complete reaction but we have 0.5Moles of Mg3P2 available Therefore Mg3P2 is in excess
No of Moles in excess at the end of the reaction = 0.5 - 0.25 = 0.25moles