Explain: The whole mass of an atom is present in the center of the atom.

Q. Question 11-12 is based on the following given information:
Assume a hypothetical cubic crystal lattice, named JEE-centered cubic (jcc) with the following characteristics:
I. An atom is present at all the corners of the cube
II. An atom is present at the center of two pairs of opposite faces
III. An atom is present at the center of all the edges of the cube
IV. One atom is present at its body-center
How many atoms are effectively present per unit cell in this hypothetical crystal lattice?

Q.

On the basis of Thomson's model of an atom, explain how an atom as a whole is neutral.

Q. Assume a hypothetical cubic crystal lattice, named JEE-centered cubic (jcc) with the following characteristics:
I. An atom is present at all the corners of the cube
II. An atom is present at the center of two pairs of opposite faces
III. An atom is present at the center of all the edges of the cube
IV. One atom is present at its body-center
An element having the jcc lattice structure has a cell edge of 120 pm. The density of the element is 6.8 g/cm³. How many atoms are present in 408 g of the element?

Q. Assume a hypothetical cubic crystal lattice, named JEE-centered cubic (jcc) with the following characteristics:
I. An atom is present at all the corners of the cube
II. An atom is present at the center of two pairs of opposite faces
III. An atom is present at the center of all the edges of the cube
IV. One atom is present at its body-center
An element having the jcc lattice structure has a cell edge of 120 pm. The density of the element is 6.8 g/cm³. How many atoms are present in 408 g of the element?

Q. Explain why, the atomic masses of many elements are in fractions and not whole numbers.