Periodic Classi...

Which of the following is not true for metalloids?

Arrange the following elements in the order of their increasing nonmetallic character: Li, O, C, Be, F

Six elements A, B, C, D, E and F have the following atomic numbers (A = 12, B = 17, C = 18, D = 7, E = 9 and F = 11). Among these elements, the element, which belongs to the 3rd period and has the highest ionization potential, is

Which of the following are the characteristics of isotopes of an element?  

i. Isotopes of an element have same atomic masses

ii. Isotopes of an element have same atomic number

iii. Isotopes of an element show same physical properties

iv. Isotopes of an element show same chemical properties

Which of the following hydroxides is most basic?

The statement that is not true about electron affinity is

The first ionization energy of an element is 736 kJ per mole of atoms. An atom of this element in the ground state has a total of how many valence electrons?

Which of the following is Dobereiner's triad?

Which of the following is the correct order of decreasing first ionization energy:

Elements in the same vertical group of the periodic table have same