Question

Pls answer the following questions ​

Answer 1

Answer:

(i) Atomic number: The atomic number is the total number of protons present in the atom. For example, the atomic number of Mg is 12. It contains 12 protons and 12 electrons.

(ii) Mass number: It is the sum of the number of neutrons and the number of protons. For example, the atomic number of Lithium is 4 which is equal to the number of protons, the number of neutrons of magnesium is 4. The mass number is equal to 8(4+4).

2. According to Bohr Atomic model, a small positively charged nucleus is surrounded by revolving negatively charged electrons in fixed orbits. He concluded that electron will have more energy if it is located away from the nucleus whereas the electrons will have less energy if it located near the nucleus.