The correct answer is: (b) 35.5 u The atomic mass of chlorine is approximately 35.5 u, which is the weighted average of the isotopes chlorine-35 and chlorine-37. This average accounts for their relative abundance in nature. Class 9th Science NCERT ...
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(d) valency of each element. The chemical formula of a molecular compound is determined by the valency of each element. The valency indicates how many bonds an element can form, which helps in combining elements in the correct ratio to ...
To find the number of neutrons in sodium (Na) and magnesium (Mg), we subtract the atomic number from the atomic mass: Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Neutrons = 23 – 11 ...
The molecular mass of glucose (C6H12O6) is calculated by adding the atomic masses of its constituent atoms: 6 carbon (12 u), 12 hydrogen (1 u), and 6 oxygen (16 u). This gives a total of 180 u. So, the correct ...
The correct answer is: (c) Atoms of same or different elements can join together to form molecules. Molecules are formed when atoms of either the same element (e.g., O₂) or different elements (e.g., H₂O) bond together. The combination of atoms ...