Test: Atomic Models - NEET MCQ

As a very few α-particles were deflected by sharp angles, it was concluded that the positive charge is concentrated in a very small volume of the atom.

Very few of bombarded α-particles on gold foil were deflected by sharp angles and therefore, it was concluded that the positive charge is concentrated in a very small volume of the atom called nucleus. Since few were deflected, the size of the nucleus is very small as compared with atom size.
Most of the particles passed through the foil undeflected and was concluded that most of the space in an atom is empty.

In 
Atomic number = No. of protons = No. of electrons = 38 
Atomic mass = 88
Number of neutrons = 88 - 38 = 50

Mass number of the element = 81
i.e., p + n = 81
Let the number of protons be x.
Number of neutrons 


Symbol of the element

Isoelectronic species means species having same number of electrons.
In CO; no. of electrons = 6 + 8 = 14
In N₂; no. of electrons = 7 + 7 = 14