Embibe Experts Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 1: KEAM 2018

Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?

The correct match among the following is

(a) Lithium, Sodium, Potassium            (i) Alkaline earth metals
(b) Beryllium, Magnesium, Calcium      (ii) Semi-metals
(c) Oxygen, Sulphur, Selenium             (iii) Alkali metaIs
(d) Silicon, Germanium, Arsenic           (iv) Chalcogens

The $\mathrm{IUPAC}$ name of an element is Unbinilium. Its atomic number is

The effective nuclear charge of an element with three valence electrons is $2.60$ . What is the atomic number of the element?

Which element has the highest first ionization potential?

The electronegativities of $N, C, Si$ and $P$ are in the order -