Question

etion-A is compulsory. All parts of this section are to be answered on the separately provided swer Sheet which should be completed in the first 20 minutes and handed over to the perintendent. Deleting/overwriting is not allowed. Do not use lead pencil. pose the correct option i.e. A/B/C/D by filling the relevant bubble for each question on the of wer Sheet according to the syllabus and instructions given. Each part carries one mark When U21 ejects a beta particle, how many protons are left in the remaining nucleus? 89 protons B. 92 protons 91 protons 93 protons C С D​

Answer 1

Many atoms consist of a positively charged nucleus consisting of protons and neutrons surrounded by a cloud of electrons charged negatively. An atom is any particle of matter at its most basic level which contains at least one proton. Here are some examples of the atoms: hydrogen (H) neon (Ne).

Answer 2

Answer:

n=A-Z (no. of neutron =Atomic mass of element-no. of proton /electron)

Z+1 = 92+1 = 93

n = A-Z = 238-93 = 145.

Protons - 93

Electrons - 93

Neutrons - 145.