An alkaline earth metal 

The amount of energy released when one or more electrons is added to the neutral atom is 

The ionization potential across a period

With reference to the variation of properties in the periodic table, which of the following is generally true?

Element 'A' has electronic configuration 2, 7; 'B' has electronic configuration 2, 8, 5 and 'C' has electronic configuration 2, 8, 7. Which two elements will exhibit similar chemical properties?

The non-metallic character of the elements from left to right across the period

Which of the element whose atomic number is given below cannot accommodate in the present set up of the long form of the periodic table?

The longest period of periodic table is

Eka-aluminium and Eka-silicon are known as 

The electronegativity of an element from left  to right across a period