Atomic Structur...

Isotopes of an element differ in their number of

Deuterium is a/an _____ of hydrogen.

When alpha particles are passed through a thin metal foil, only one out of thousands of particles is rebounded. This observation leads to the conclusion that

Which among the following pairs of shells has least energy difference between two adjacent orbits?

Which one of the following shows the group of atoms having the same number of neutrons in their nuclei?

The nucleus of hydrogen atom consists of

Who discovered neutrons?

Atoms of an element differ from atoms of all the other elements in

For which of the following, only integers are possible?

I. Valency
II. Oxidation state
III. Atomic number
IV. Atomic weight

What is the atomic number of an element that possesses 20 electrons in its N - orbital?

Atomic weight of various elements is referred by taking standard

Which one of the following has variable valency?

The valency of cupric ion is

What is the valency of an element having atomic number 54?

Which among the following represents isobars?

What is the maximum number of electrons present in N - shell?

Which of the following correctly defines Zeeman effect?

How many electrons are there in the valence shell of an element having atomic number 16?

Which among the following pairs has different number of valence electrons?

Two elements A and B combine forming a compound whose molecular formula is AB₂. The valences of A and B are