Answer question number 1 to 4 on the basis of your understanding of the following paragraph and related studied concepts.
The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).
Average atomic mass = f1M1 + f2M2 + … + fnMn where f is the fraction representing the natural abundance of the isotope and M is the mass number (weight) of the isotope.
The average atomic mass of an element can be found on the periodic table, typically under the elemental symbol. When data are available regarding the natural abundance of various isotopes of an element, it is simple to calculate the average atomic mass.
Q1. Give reason-Isotopes of an element are chemically similar.
Q2. Lithium has two naturally occurring isotopes: lithium-6 and lithium-7. If the average
atomic mass of lithium is6.941 u, which isotope is the most abundant?
Q3. Give the number of all the subatomic particles present in a pair of isotope.
Q4. Give one example of isobars. class 9
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Answers
Answer:
(A) Hi Minnisaxena, Isotopes are elements with same atomic number and different atomic mass number. They have the same number of electrons and thus the same electronic configuration. As the chemical properties of an element depend on their electronic configuration , these elements are chemically similar
(B) The average atomic mass of whatever element calculates as sum of isotopes mass multiplied by percentage of abundance on the Earth. Li7 is most abundant.
(C) To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number:
number of protons = atomic number.
number of electrons = atomic number.
number of neutrons = mass number - atomic number.
(4) Argon, potassium, and calcium having atoms of the same mass number 40. 18Ar40, 19K40, 20Ca40 where 18, 19 and 20 shown as subscripts are the atomic numbers of the three elements respectively are isobars. Since the atomic numbers are different their chemical properties are also different.