Atomic Number: Atomic number of an element is equal to the number of protons present in the nucleus of an element. Atomic number = number of protons in one atom of element. Since the atom as a whole is neutral therefore atomic number is the same as the number of electrons around the nucleus of
Each atom is made up of an inner core called the nucleus. – Most of the atom’s mass is located in the relatively small nucleus. – The rest of the atom is comprised of a relatively large region outside the nucleus where the electrons are found. – The atom is made of 3 subatomic particles:
Dalton’s Model of the atom. It is the basis of our understanding of the nature of matter. The following four statements comprise Dalton’s Model: a – All matter is made up of extremely tiny. particles. called atoms. b- Atoms are indivisible. c – Atoms of the same element are alike. d – Atoms of different