Answer : The correct answer is, (c) the number of neutrons
Explanation :
Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.
Atomic number is defined as the number of protons or number of electrons.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and number of neutrons.
Number of neutrons = Mass number - Atomic number
For example : For Carbon - 13 isotope.
Mass number = 13
Atomic number = 6
Number of neutrons = Mass number - Atomic number
Number of neutrons = 13 - 6 = 7
Hence, the difference between the mass number of an isotope and its atomic number is the number of neutrons.
A group of environmentalists were discussing the benefits and drawbacks associated with using fossil fuels. Which argument <span>best </span>fits the conversation?
Fossil fuels are cheaper than alternative forms of energy.Fossil fuel reserves will never be depleted.<span>Fossil fuels are easily renewed. </span><span>Fossil fuel use does not affect the environment.</span>
Answer:
2KClO3(s) + heat → 2KCl(s) + 3O2(g)
Explanation:
KClO3(s) + heat → KCl(s) + O2(g)
Adding coefficients so that there are 6 O atoms on both sides.
2KClO3(s) + heat → KCl(s) + 3O2(g)
Balancing K and Cl atoms, there are 2 of each on the left and 1 of each on the right.
2KClO3(s) + heat → 2KCl(s) + 3O2(g)
The equation is now balanced.