(a) Write the elements in the ascending order of their atomic radii. (b) Which of the 2^nd ****** elements closer

Question

Some elements belonging to second ** of periodic table, and their atomic radii are given below.Observe them and write answers.

| 2nd ** elements | B | Be | O | N | Li | C |
| Atomic radii | 88 | 111 | 66 | 74 | 152 | 77 |

(a) Write the elements in the ascending order of their atomic radii.

(b) Which of the 2nd ** elements closer to the configuration of inert gas ?

(c) Which is the outermost orbit of all these elements ?

(d) Which elements atomic size ** Beryllium or Carbon ? Why ?

Answer 1

(a) The ascending order of atomic sizes is O, N, C, B, Be and Li.

(b) Lithium has closest inert gas configuration i.e., 1s2 2s1.Its nearest inert gas is Helium.

(c) The outermost orbit for all these elements is second orbit.

(d) Beryllium has more atomic size than Carbon. Because when we move across a ** the atomic number increases. So nuclear attraction of outermost orbit increases. So carbon has lesser size than Beryllium.