Home Work Assignment -11. Atomic number of an element is equal to the number of --------------- in the nucleus of the atom.2. The mass number and atomic number of Sodium are 23 and 11 respectively. The number of neutrons in the nucleus is _________________3. Isotopes of an element have ________ atomic number but ________ mass numbers.4. The atoms which have same mass number but different atomic numbers are called ________5. Atoms which have different atomic numbers, different mass numbers but the same number of neutrons are called _________6. Two nuclei A and B are isotonic with mass numbers 15 and 16 respectively. If A contains 7 protons, then the number of protons in B will be _________7. Magnesium atom and Mg+2 ions have same number of _______________8. Why is the atomic mass of an element not a whole number?

9. Dalton suggested that atoms were indestructible and unchangeble to explain:why elements combine in fixed weight ratios to form compounds

why compounds combine in fixed weight ratios in chemical reactions

why mass is conserved in chemical reactions

why elements are characterized by the mass of their atoms

10. Dalton said that elements are different distinguished from each other by:

the charge on their ionsthe density of their solid forms

the shapes of their atomsthe weights of their atoms

11. 1.008 grams of hydrogen combines with 35.453 g of chlorine to form 36.463 g of a pure compound (hydrogen chloride). Dalton's explanation for this experimental fact might be:

hydrogen and chlorine atoms always combine in a 1:35 ratio.

one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction

hydrogen and chlorine atoms aren't created or destroyed in the process so the reactant mass is the same as the product mass.

this is a simple mixture of elements because the ratio isn't a whole number ratio

chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride

12. .Dalton viewed chemical change as:

a change of atoms from one type into anothera rearrangement of atoms

a transfer of protonscreation and destruction of atoms

a nuclear exchangea transfer of electrons

13. Which of the following isnota postulate of Dalton's atomic theory?atoms are not created or destroyed in chemical change

chemical change is a rearrangement of atoms

atoms combine in simple whole number ratios to form compounds

different elements have atoms of different masses

atoms of a single element can have different masses

14. In Thomson's plum pudding model what do the plums represent and what does the pudding represent? If you were to teach in a class, and the students do not know about plum pudding, what model from nature you will use to explain the concepts that Thomson postulated in his model and explain in one or two sentences why have you chosen that model?

15. If I bombard positively charged particles with heavy mass in Thomsons Plum Pudding Model what observations would I expect to happen and why? Account scientifically your prediction based on your understanding of Thomsons Plum Pudding Model.

Quiz-1

Define the following-Q.1. Hunds rule.Q.2. Afbau ruleQ.3. Bohrs theoryQ.4.Ultraviolet (UV) CatastropheQ.5. Quantum numbersQ.6.Heisenberg uncertainity principleQ7. Calculate momentum of particle having wavelength 0.1nm.Q8. Write about the proposed atomic model from primitive to modern by name and year .Q9. Plancks Law of Black Body Radiation Q10.Calculate uncertainity in position of an electron (m= 9.1 x 10-31)kg if uncertainity in velocity is 5.7 x 105 m sec-1