Structure of At...

What does Bohr's atomic theory explain?

The mass number of an element is 27. If it has 14 neutrons then valence shell of this element is :

An atom has mass number $$23$$ and atomic number $$11$$. How many protons, electrons and neutrons are present in the atom?

The atomic number (Z) of an element is 25. In its ground state, how many electrons are present in the N shell:

The atom of an element has $$10$$ electrons, $$10$$ protons and $$12$$ neutrons. Find the mass number of the element:

How are the two atoms $$_{ 92 }^{ 235 }{ P }$$ and $$_{ 92 }^{ 238 }{ P }$$ similar?
(i) They have the same number of protons
(ii) They have the same number of neutrons
(iii) They have the same number of electrons

An element has atomic number $$17$$ and mass number $$37$$. There are $$17$$ electrons outside the nucleus. Find the number of neutrons in it.

An element has an atomic number $$20$$. How many electrons will be present in $$K, L, M$$ and $$N$$ shells of its atom?

What does the mass number of an atom represent?