1.
Which of the following are the characteristics of isotopes of an element? (i) Isotopes of an elements have same atomic masses. (ii) Isotopes of an element have same atomic number. (iii) Isotopes of an element show same physical properties. (iv) Isotopes of an element show same chemical properties.
2.
Which of the following is the outermost shell for elements of period 22
3.
Arrange the following elements in the order of their decreasing metallic character: Na,Si,Cl,Mg, Al
4.
Arrange the following elements in the order of their increasing non-metallic character: Li, O, C, Be, F
5.
In Mendeleev's periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?
6.
What type of oxide would Eka-aluminium form?
7.
Which one of the following elements exhibit maximum number of valence electrons ?
8.
Which of the following elements does not lose an electron easily?
9.
Which of the following gives the correct increasing order of the atomic radii of O.F and N
10.
Which of the following elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
11.
Where would you locate the elements with electronic configuration 2, 8 in the modern periodic table?
12.
Which of the following statement (s) about the modern periodic table are incorrect? (i) The elements in the modern periodic table are arranged on the basis of their decreasing atomic number. (ii) The elements in the modern periodic table are arranged on the basis of their increasing atomic masses. (iii) Isotopes are placed in adjoining group(s) in the periodic table. (iv) The elements in the modern periodic table are arranged on the basis of their increasing atomic number.
13.
An element which is an essential constituent of all organic compounds belongs to
14.
Three elements B, Si and Ge are:
15.
Which of the following statements about the modern periodic table is correct?
16.
The elements A, B, C, D and E have atomic number 9, 11.17 12 and 13 respectively. Which pair of elements belong to the same group?
17.
Upto which element, the Law of Octaves was found to be applicable:
18.
Which among the following elements has the largest atomic radii?
19.
Which of the following elements would lose an electron easily?
20.
According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of
