Question

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Answer 1

Thallium is the new element
TI is its symbol
Atomic no. Is 81
Mass is 204.38

Answer 2

Answer : The correct answer is Name = Thallium (Th) , atomic mass = 210 and atomic number = 81 .

Alpha decay :

When atomic nucleus emits an alpha particle that process is known as alpha particle decay . The symbol of alpha particle is $^4_2He$ . where 4 is atomic mass ( 2 protons + 2 neutrons ) and 2 atomic number .

When alpha particle is released the resultant nuclei (daughter nuclei) have 4 less atomic mass and 2 less atomic number .

Example for nuclear equation of alpha decay can be expressed as:

${_{90}^{230}Th} \rightarrow {_2^4He} + {_{88}^{226}Ra}$

Given :

Radioisotope = Bi Atomic mass = 214 Atomic number = 83

When it will release alpha particle , atomic mass will be decreased by 4 and atomic number by 2 .

Atomic mass = 214 - 4 = 210 Atomic number = 83-2 = 81

The atom with atomic number 81 is Thallium (Th) . Hence the daughter nuclei so produced is $^2^1^0_8_1Th$

The nuclear reaction can be written as :

$^{214}_{83}Bi \rightarrow _2^4He + _{81}^{210}Th$