Question

In Mendeleev's periodic table, gap was not left for one of the following elements. This element is
(a) gallium
(b) beryllium
(c) germanium
(d) scandium

Answer 1

beryllium is right answer

thanks

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Answer 2

In Mendeleev’s periodic table, gap was not left was Beryllium.

Explanation:

• In the periodic table, the gap is left for scandium, gallium and germanium. For Beryllium alone there is no gap.
• Beryllium is an element with the atomic number 4 and the symbol Be. The atomic mass of Beryllium is 9.012182 u. It has the electronic configuration of [He] $2s^2$. And, the electrons per shell will be 2, 2.  
• It is not available easily. It is usually found as a product of larger atomic nuclei’s spallation.