CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES Set 2

First period ✘ Second period ✘ Fourth period ✘ Ninth period ✔ NULL ✔ NULL NULL

; atomic radius ✘ ; first ionisation enthalpy ✘ ; electron affinity ✘ ; electronegativity ✔ NULL ✔ NULL NULL

Ionic bond ✘ Polar covalent bond ✘ Non-polar covalent bond ✘ None of the above ✔ NULL ✔ NULL NULL

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

Sodium and chlorine both lose electrons ✘ Sodium and chlorine both gain electrons ✘ Sodium loses but chlorine gains electrons ✘ Sodium gains but chlorine loses electrons ✔ NULL ✔ NULL NULL

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

The electronegativity of hydrogen is greater than that of chlorine ✘ The electronegativity of hydrogen is equal to than that of chlorine ✘ The electronegativity of chlorine is greater than that of hydrogen ✘ Hydrogen and chlorine are gases ✔ NULL ✔ NULL NULL

Pure covalent ✘ Partial covalent ✘ Partial ionic ✘ Coordinate covalent ✔ NULL ✔ NULL NULL

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

Many elements has several isotopes ✘ Noble gases do not form compounds ✘ Some groups stand divided into two sub groups and ✘ Atomic weights of elements are not always whole numbers ✔ NULL ✔ NULL NULL