The correct answer is: (a) (i) and (iii) Rutherford’s model of the atom considered the nucleus as positively charged (i), and it can be compared to the solar system (iii), with electrons orbiting the nucleus like planets orbiting the sun.
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The incorrect statement is: (d) An isotope of magnesium is used in the formation of chlorophyll. Magnesium itself (not its isotope) is essential in the formation of chlorophyll, but the isotope of magnesium is not specifically used in this process.
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 ...
(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 ...