1. Which group was added in Mendeleev’s periodic table?
A. l group
B. Vll group
C. Zero group
D. V group
ANSWER:C.Zero group
SOLUTION : Later (1902), Mendeleev accepted the evidence for their existence, and they could be placed in a new “group 0”, consistently and without breaking the periodic table principle.
2. Name the most electronegative element of Periodic table?
A. Chlorine
B. Bromine
C. Fluorine
D. Iodine
ANSWER:C.Fluorine
SOLUTION:The most electronegative element is fluorine. The least electronegative or most electropositive element is francium.
3. Out of F and Cl, which has higher electron affinity?
A. CI
B. F
C. Both have same
D. None
ANSWER : A.CI
SOLUTION: Chlorine (Cl) has a higher electron affinity than fluorine (F).
4. The element with atomic number 9 resembles the element with atomic number __________.
A. 35
B. 27
C. 17
D. 8
ANSWER:C.17
SOLUTION:From the above discussion we can say that the element with atomic number 9 (Fluorine) will show properties similar to the element with atomic number 17 (chlorine) because both are halogens.
5. Why N is more electronegative than Phosphorous?
A. Because it has less mass than Phosphorous
B. Because it has half filled valence shell
C. Because it forms so many compounds
D. Because it has small size than Phosphorous
ANSWER:D.Because it has small size than Phosphorous
SOLUTION:The element nitrogen will be more electronegative because of the smaller size of its atom compared to phosphorus. Since nitrogen has a smaller atomic radius than phosphorus, the attraction of its nucleus towards the incoming electron is more than phosphorus. Therefore, nitrogen accepts electrons more easily.
6. In the periodic table , zig zag lines separate metals from non metals, what is called ?
A. Metalloids
B. Lanthanoids
C. Actinoids
D. Diagonal relationship
ANSWER:A.Metalloids
SOLUTION:The zig-zag line on the periodic table that separates metals from non-metals is also known as the metalloid line. The elements that touch the line are called metalloids or semimetals. These elements have properties that fall between those of metals and non-metals.
7. Write the formula to find the maximum number of eletrons that shell can accommodate_________.
A. 2n
B. 4(n)2
C. 2n2
D. 4n
ANSWER:C.2n2
SOLUTION :
The maximum number of electrons that can be filled in an orbit (shell) can be found by using the formula 2n2; where ‘n’ stands for an orbit’s serial number.
8. Predict the position of Fluorine ________.
A. 17th group , 2nd period
B. 18th group, 2nd period
C. 17th group, 3rd period
D. 7th group, 2nd period
ANSWER: A.17th group , 2nd period
SOLUTION: Fluorine is an element on the periodic table. It is the first element in group 17. It is located in the 3rd period in the 17th group.
9. Name the element with only 4 electrons in valence shell________.
A. C
B. Ge
C. Si
D. Al
ANSWER:A.C
SOLUTION: Carbon (C) is the element with four electrons in its valence shell.
10. Which element has twice as many as electrons in first shell ?
A. Si
B. Ge
C. N
D. C
ANSWER: D.C
SOLUTION:
The element which has twice as many electrons in its second shell as in the first shell is carbon.