Element that has the greatest tendency to lose an electron is :
1. | F | 2. | Fr |
3. | S | 4. | Be |
The outer electronic configuration of Gd (Atomic no. 64) is:
1. 4f3 5d56d2
2. 4f8 5d106d2
3. 4f4 5d46d2
4. 4f7 5d16s2
The radius of La3+ (at. no. 57) is 1.06 The radius of Lu3+ (at.no. 71) might be:
1. 1.06
2. 0.85
3. 1.60
4. 1.40
Which of the following transition metal ions has the lowest density?
1. Copper
2. Nickel
3. Scandium
4. Zinc
Ionic radii are :
1. Inversely proportional to the effective nuclear charge.
2. Inversely proportional to the square of effective nuclear charge.
3. Directly proportional to the effective nuclear charge.
4. Directly proportional to the square of effective nuclear charge.
Which one is a metalloid?
1. Tin
2. Germanium
3. Sulphur
4. Carbon
Zn and Cd do not show variable valency like 'd' block elements due to :
1. Softness
2. Completed 'd' orbital
3. Two electrons in outermost orbit
4. Low m.p.
In the long form of periodic table, the elements having lowest ionization potential are placed in:
1. I group
2. IV group
3. VII group
4. Zero group
Elements with an electronic configuration 1s2 2s22p6 3s23p63d10 4s24p64d10 5s25p3 belong to the group :
1. | 3rd | 2. | 15th |
3. | 17th | 4. | 2nd |
Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
1. 3d3,4s2
2. 3d5,4s1
3. 3d5,4s2
4. 3d2,4s2