An example of metalloid elements in the periodic table is:
1. | Na and K | 2. | Cu and Al |
3. | As and Si | 4. | Ca and Mg |
The element with atomic number 26 is:
1. A non-metal
2. Krypton
3. Iron
4. Manganese
The alkali metals have:
1. highest ionization energy
2. largest atomic radii
3. highest density
4. highest electronegativity
The telluric helix was given by:
1. Newland
2. Mendeleev
3. Lothar Meyer
4. De-chancourtois
The element with atomic number 30 is expected to be present in:
1. IB group
2. IA group
3. IIA group
4. IIB group
Which among the following elements is the bridge element?
1. K
2. O
3. Mg
4. Pb
Four successive members of the first-row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
1. Vanadium (Z = 23)
2. Chromium (Z = 24)
3. Iron (Z = 26)
4. Manganese (Z = 25)
Transition elements show:
1. variable valency
2. paramagnetism
3. catalytic properties
4. all of these
The transition elements are more metallic than the representative elements because they have:
1. The electrons in d-orbitals
2. Electron pairs in d-orbitals
3. Availability of d-orbitals for bonding
4. Unpaired electrons in metallic orbitals