Question

Given below are four elements with their atomic numbers:
Atomic Number:a,b,c,d Atomic number:16,11,3 14 Identify the clement which belong to same group of Modem Periodic Table.
Gi) Amange the given elements in decreasing order of atomic size.
(i) Write the formula of the oxide of B'.
(iv) Which of the above element is a metalloid?​

Answer 1

Answer:

The electronic configuration of all the elements are following:-

A=2,8,6

B=2,8,1

C=2,1

D=2,8,4

Elements A have a tendency to gain electron so it behaves as non-metal.

Elements B and C have a tendency to lose electrons and become stable by acquiring octet, so these are metals.

Element D can neither lose nor gain 4 electrons to become stable. Hence it is metalloid.

So, the answer is D