Question

First member of each of the groups 1, 2, 13-17 differ in many respects from other members of their
respective groups because of
i) small size
ii) high electronegativity
iii) absence of d-orbitals in valence shell
iv) absence of isotopes
A) i & ii
B) iii
C) i, ii & iii D) i, ii, iii & iv
​

Answer 1

Answer:

I think option A

if it is correct plzz follow me dear

Answer 2

The correct option is C) i, ii & iii.

Size in periodic table:

• Atomic radii in the periodic table drop across a row from left to right and increase across a column from top to bottom.
• The atomic radius measures the separation between the nucleus and the outermost edge of the electron cloud.
• Atomic radius typically increases along a group and decreases over a period.
• Effective nuclear charge rises with time while electron shielding stays constant.
• The first member of each of the groups 1, 2, 13-17 is the smallest in their respective groups.

Electronegativity in periodic table:

• The propensity of an atom of a certain chemical element to draw shared electrons while forming a chemical bond is known as electronegativity and is denoted by the symbol.
• The atomic number and the separation of the valence electrons from the charged nucleus have an impact on an atom's electronegativity.
• Moving from left to right along a period improves electronegativity.
• This is caused by a decrease in atomic size and a rise in nuclear charge, which allows a shared electron pair to be more attracted to one another.
• The first member of each of the groups 1, 2, 13-17 has the highest electronegativity in their respective groups.

Absence of d-orbitals:

• The first member of each of the groups 1, 2, 13-17 all have no d orbitals.
• As they only have two shells except for H.

Presence of Isotopes:

• The first member of each of the groups 1, 2, 13-17 all have isotopes.

SPJ3