Question

Element ‘X’ (Atomic number = 10) is a gas present in the group 18 of the modern periodic table and element ‘Y’ is the metalloid present in the $3^{rd}$ period of the Modern periodic table. Based on this information choose the incorrect statement(s).

• A. The element present just before element ‘X’ in the ${17}^{th}$ group is the most electronegative element of the Modern periodic table.
• B. Number of valence electrons present in element ‘Y’ is 4.
• C. Element ‘Y’ was known as eka-silicon in the Mendeleev’s periodic table.
• D. Valency and period number of element ‘X’ is 0 and 2 respectively.

Answer 1

The correct option is C Element ‘Y’ was known as eka-silicon in the Mendeleev’s periodic table.

Element ‘X’ with atomic number 10 is Neon (Ne). The element ‘Y’ is Silicon (Si). It is a metalloid present in the third period of the Modern Periodic Table. Germanium was known as Eka-silicon in Mendeléev’s Periodic Table.
Hence, the correct answer is option (c).