All the non-metals in the long form of the periodic table are placed under:
1. s-Block
2. p-Block
3. f-Block
4. d-Block
General electronic configuration of the transition elements is given by:
1. ns2nd1-10
2. ns2np6nd1-10
3. (n-1)d1-10np6
4. (n-1)d1-10ns1-2
The statement that is incorrect for the periodic classification of elements is:
1. | The properties of elements are a periodic function of their atomic number. |
2. | Non-metallic elements are lesser in number than metallic elements. |
3. | The first ionization energies of elements along a period do not vary in a regular manner with an increase in atomic number. |
4. | For transition elements, the d-subshells are filled with electrons monotonically with an increase in atomic number. |
The ions O2-, F-, Na+, Mg2+, and Al3+ are isoelectronic. Their ionic radii show [2003]
1. an increase from O2- to F- and then decrease from Na+ to Al3+
2. a decrease from O2- to F- and then increase from Na+ to Al3+
3. a significant increase from O2- to Al3+
4. a significant decrease from O2- to Al3+
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