Element 58Ce belongs to:
1. s-block elements
2. p-block elements
3. d-block elements
4. f-block elements
General electronic configuration of outermost and penultimate shell of an atom is
(n - 1)s2 (n - 1) p6 (n - 1)dx ns2. If n = 4 and x = 5, the number of proton in the nucleus is:
1. > 25
2. < 24
3. 25
4. 30
The maximum number of valence electrons possible for atoms in the second period of the periodic table is:
1. 18
2. 10
3. 8
4. 2
The element having atomic number 19, is:
1. an inert gas
2. a metal with oxidation number +1
3. a non-metal with oxidation number -3
4. a metal with oxidation number -3
An element having the electronic configuration of its atom ns2 np2 should have similar properties to those of:
1. Sodium
2. Carbon
3. Magnesium
4. Oxygen
The electronic configuration that represents the d-block element is:
1. 1s2 2s2 2p6 3s23p63d10 4s24p6
2. 1s2 2s2 2p6 3s23p63d10 4s24p1
3. 1s2 2s2 2p6 3s23p63d10 4s2
4. 1s2 2s2 3s23p6 4s2
The most common oxidation state of cerium (Ce) is:
1. +5, +3
2. +5, +4
3. +3, +4
4. +3, +5
In the transition elements, the incoming electron occupies (n-1)d sublevel in preference to:
1. np
2. ns
3. (n-1)d
4. (n+1)s
The electronic configuration of the most electropositive element is :
1. [He]2s1
2. [Xe]6s1
3. [He]2s2
4. [Xe]6s2
Elements with an electronic configuration 1s2 2s22p6 3s23p63d10 4s24p64d10 5s25p3 belong to the group :
1. | 3rd | 2. | 15th |
3. | 17th | 4. | 2nd |