Which of the following element does not lose an electron easily?

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:

Which of the following element would lose an electron easily?

Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?

An element which is an essential constituent of all organic compouds belongs to following group of modern periodic table: