1. Tardigrade
  2. Question
  3. Chemistry
  4. Which of the following are correct? (i) First ionisation enthalpy of He < Second ionization enthalpy of Li. (ii) Li has the highest second ionisation enthalpy. (iii) All d - block elements are transition elements. (iv) The only alphabet not found in the periodic table is the letter 'J'. (v) Francium concentration is ∼ 10-18 ppm on Earth.

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Q. Which of the following are correct?
(i) First ionisation enthalpy of $He <$ Second ionization enthalpy of $Li$.
(ii) $Li$ has the highest second ionisation enthalpy.
(iii) All $d$ - block elements are transition elements.
(iv) The only alphabet not found in the periodic table is the letter $'J'$.
(v) Francium concentration is $\sim 10^{-18}\, ppm$ on Earth.

TS EAMCET 2018

Solution:

All transition elements are $d$ - block elements but all $d$ - block elements are not transition metals. A transition metal is one which forms one or more stable ions which have incomplete $d$ - orbitals. On the basis of this definition, scandium and zinc do not count as transition metal although they are $d$ - block elements.