Question

Consider the following statements and arrange in the order of true/false as given in the codes.
$S_1$: In the modern periodic table each block contains a number of columns equal to the number of electrons that can occupy that sub-shell.
$S_2$: the greatest increase in ionization enthalpy is experienced on the removal of the electron from the core noble gas configuration.
$S_3$: The size of the isoelectronic species is affected by electron-electron interaction in the outer orbitals.
$S_4$: Anything that influences the valence electrons will affect the chemistry of the element and the valence shell is not affected by nuclear mass.

• A. FFTT
• B. TTFT
• C. FTFT
• D. TTTT

Answer 1

Answer: (B)

TTFT

The size of isoelectronic species depends on nuclear charge. Greater the nuclear change, smaller would be the size. the size of isoelectronic species depends on nuclear charge. As the nuclear attractions increases the electrons are strongly bound to nucleus.

$S_3$ is false.

Mosley's periodic table:Physical and chemical properties of elements are the periodic functions of their atomic number. If the elements are arranged in order of their increasing atomic number, after a regular interval, element with similar properties are repeated.