The position of eight elements in the modern periodic table is given below where atomic numbers of elements are given in the parenthesis.
| Period No. |
|
|
| 2 |
Li(3) |
Be(4) |
| 3 |
Na(11) |
Ms(12) |
| 4 |
K(19) |
Ca(20) |
| 5 |
Rb(37) |
Sr(38) |
(i) Write the electronic configuration of Ca.
(ii) Predict the number of valence electrons in Rb.
(iii) What is the number of shells in Sr ?
(iv) Predict whether K is a metal or a non-metal.
(v) Which one of these elements has the largest atom in size ?
(vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.
