Periodic Classification Of Elements - Study Mode
[#61] The correct sequence of metallic character of the given elements:
Correct Answer
(D) Li < Na < K < Rb < Cs
[#62] The electronic configuration of an element is 2, 8, 1. It is included in . . . . . . . .
Correct Answer
(C) Group 1 of the third period
[#63] In Mendeleev's periodic table, the periodic nature of properties of the elements considered on the basis of . . . . . . . .
Correct Answer
(B) Atomic mass
[#64] In the modern periodic table in a same group the elements have . . . . . . . . of their atoms.
Correct Answer
(D) same electron number in outer cell
[#65] Which of the following elements replaces eca-aluminium in Mandeleev's periodic table?
Correct Answer
(B) Gallium