Which of the following Statements are NOT true about the periodic table? A. The properties of elements are function of…

🧠 Modern periodic table: properties are function of atomic NUMBER, similar config → same GROUP (not period), and elements per period = 2 × orbitals (not equal) Three errors to find: (A) uses "weight" instead of "number"; (C) confuses group with period; (E) gets the count wrong.

🗺️ Check each statement A. "Properties are function of atomic weights" — FALSE. The Modern Periodic Law uses atomic NUMBER (Moseley). Atomic weight is Mendeleev's old basis.

B. "Properties are function of atomic numbers" — TRUE. This IS the Modern Periodic Law.

C. "Elements with similar outer electronic configuration are arranged in same period" — FALSE. Similar outer config (e.g., $ns^1$ for all alkali metals) means same GROUP, not same period. Same period = same principal quantum number n.

D. "Element's location reflects quantum numbers of last filled orbital" — TRUE. The period = principal quantum number $n$; the block = subshell type; the group follows from the configuration.

E. "Number of elements in a period = number of atomic orbitals available" — FALSE. Each orbital holds 2 electrons, so number of elements = 2 × number of orbitals (e.g., Period 2 has 4 orbitals but 8 elements).

A, C, E are not true.

$\boxed{\text{Answer: (a)}}$