Question

(a) Which of the nuclear particles is present in the same fixed number in the atoms of any particular element?
(b) What do we call this number which is characteristic of a particular element?

Answer 1

(a) Protons are present in the same fixed number in the atoms of any particular element.

(b) The atomic number is the characteristic of a particular element.  

Explanation:

• In the nucleus of each atom, one or more protons can be found as they are an important part of the nucleus. An element’s defining part is the number of protons present inside the nucleus. This is called the atomic number.  
• The atomic number of an element is determined by the number of protons present inside the nucleus. For instance, the hydrogen atom has only one proton and it can be said that the atomic number of hydrogen is 1.

You can get all the answers of Chapter 4 in the link below:

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Answer 2

Answer:

(a) Proton

(b) Atomic number