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Atomic mass definition1/5/2023 ![]() ![]() Ques: Explain how the atomic weight can be measured? (2 marks)Īns: For any isotope, the sum of total numbers of its protons & neutrons are identified as mass numbers. Ques: What will be the mass number of an element having 15 as atomic number and the total number of protons present is 15? (2 marks)Īns: We can calculate the mass number using the formula,Ītomic number = Number of Protons present All the elements which have atomic numbers greater than equal to 92 are considered to be heavy elements. Atomic Number Element Atomic Mass (u) Atomic mass (u)(Rounded off) 1: Atomic mass of Hydrogen (H) 1.008: 1: 2: Atomic mass of Helium (He) 4.002: 4: 3: Atomic mass of Lithium (Li) 6. In the nucleus of an atom, the atomic number corresponds to the number of protons. Atomic mass of all elements (along with the rounded off values) is mentioned in the chart below. The atomic number of uranium is 92 hence, it is the heaviest element. Ques: Which is the heaviest element? (2 marks)Īns: The heaviest element or stable element is Uranium. Ques: What are the different ways to calculate atomic mass? (3 marks)Īns: There are commonly three methods with the help of which you can determine the atomic mass of a given element based upon the circumstances, which is as follows: Definition of Atomic Mass Atoms are the basic units of matter. Atomic mass indicates the size of an atom. Ques: What is the element mass number when the atomic number is 18 and the neutron number is 20? (3 marks)Ītomic mass number= No. Atomic Mass or Weight Definition Atomic mass, which is also known as atomic weight, is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally occurring element. ![]()
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