25 Questions in Organic Chemistry
PERIODIC TABLE
1. The three forms of elements at room temperature and pressure are __________, ____________ , ____________ .
Answer: solids, liquids, gases
2. How will you show that though elements are different as a group they show same property?
Answer: Elements of the same group for example fluorine ,chlorine , iodine combine with sodium in a ratio 1:1 to form NaF , NaCl ,NaBr, and NaI. These all are white solids that dissolve in water and conduct electricity. This shows that though elements are different as a group they show same property.
3. Periodic table was first proposed by ________________ .
Answer: John Newlands
4. The elements were arranged by John in the increasing order of ___________ .
Answer: atomic mass
5. The pattern designed by Newlands is called ---------------
Answer: law of octaves
6. According to Newlands elements of a row have similar ___________
Answer: physical and chemical property.
7. ___________ was the first to in vent periodic table.
Answer: Mendeleev
8. Moseley’s periodic table is based on _____________
a. Atomic number
b. Atomic mass
c. Molecular number
Answer: atomic number
9. How does Mendeleev ‘s table differ from Moseley’s table
Answer: In Mendeleev’s table which is arranged according to the increasing order of atomic mass all the elements do not fit inside whereas in Moseley’s table all elements fit inside as they are arranged according to the increasing order of atomic number.
10. Define periodic law
Answer: Periodic law states that when the elements are arranged according to their atomic number elements with similar properties appear at regular intervals.
11. The electrons in the outermost energy level are called __________ .
Answer: valence electrons.
12. True or false:
Elements with same valence electrons have similar property.
Answer: True, because only valence electrons participate in a reaction , they have same property.
13. Why do elements in the far left have one valence electron while that in the far right has eight electrons?
Answer he s and p orbital’s are filled in a sequential order. As they are arranged in the increasing order from left to right in the table the far left element has one electron and the far right has eight electrons.
14. Elements in the same period have _____________ occupied energy levels.
Answer: same
15. What do you mean by an element is placed in period 2?
Answer: It means the element’s electrons occupy two principal energy levels including the 2s and 2p orbital.
16. A periodic table is required to tell to which element
Answer: False, based on its electronic configuration its position can be predicted.
17. What do you understand from the fact that the electronic configuration of germanium
Is [Ar} 3d10 4s2 4p2
Answer: It means a. its principal quantum number is 4
b. It has four occupied energy levels.
c. It is placed in the period 4
18. What is the basic information you get from a periodic table?
Answer: The atomic number, symbol, name, atomic mass, electronic configuration of an element can be known.
The macronutrient essential for muscle action is ____________-
Answer: magnesium
19. The macronutrient essential for nerve action is __________-
Answer: potassium
20. The element that is required in small quantities for human life is ___________
Answer: micronutrients
21. The main group elements are also called _________________
Answer: representative elements
22. The main group elements have their outer most configuration as ___________
Answer: s and p orbitals
23. What are the elements that are found most abundantly in the earth?
Answer: silicon, oxygen
24. The main macronutrients our body needs are _____________
a. Hydrogen , oxygen , carbon
b. Potassium , magnesium , calcium
c. Titanium , germanium , silver
Answer: a
25. Why does potassium react with water?
Answer: Potassium is a alkali metal which tends to lose its outer most one valence electron easily to attain the stable configuration. Hence it reacts readily with water.
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